UEFI (Unified Extensible Firmware Interface) - Install Windows 8 with

How to Install Windows 8 or Windows 8.1 using the "Unified Extensible Firmware Interface" (UEFI)


information   Information
Systems that are built using Unified Extensible Firmware Interface (UEFI) are more likely to achieve very fast pre-boot times when compared to those with traditional BIOS. This isn’t because UEFI is inherently faster, but because UEFI writers starting from scratch are more able to optimize their implementation rather than building upon a BIOS implementation that may be many years old.

Delivering fast boot times in Windows 8 - Building Windows 8 - Site Home - MSDN Blogs

This method can also be used for the UEFI installation of Windows 7, Windows Server 2008 SP1, Windows Server 2008 R2, and Windows Vista SP1.

Note   Note
You will need to satisfy the following requirements in order to proceed:

  • A Windows 8 compatible system
  • A Windows 8 64-bit installation media. 32-bit is not supported.
  • A UEFI v2.0+ compliant PC. Check your chipset manufacturer/firmware documentation.
  • A blank, partition-free, hard disk for installation.
warning   Warning

  • Disabling UEFI will make the system unbootable as there is no MBR on the disks.
  • You CANNOT make a sector-by-sector copy of GPT disks. The Disk and Partition GUIDs will no longer be unique. This must never happen. You can make a sector-by-sector copy of the contents of ESP or basic data partitions.



Here's How:

1. Do step 2 or 3 below depending on what installation Media you are using.

2. If using a 64-bit Windows 8 or 8.1 Installation DVD with UEFI

A) Insert the DVD, restart the computer, and go to step 4 below.
NOTE: If you are unsure that your 64-bit DVD has UEFI support, then see OPTION TWO here: Windows 8 and Windows 8.1 ISO - Download or Create


3. If using a 64-bit Windows 8 or 8.1 Installation USB Flash Drive with UEFI

A) If you have not already, you will need to create a Windows 8 or 8.1 installation bootable USB flash drive with UEFI from either a Windows 8 installation ISO or DVD.

B) Connect the USB, restart the computer, and go to step 4 below.



4. Press whatever key (ex: F11) it shows to boot to your motherboard's boot menu, and select to boot from the listed UEFI DVD or UEFI USB. (see screenshot below)

UEFI_USB_Boot_Menu.jpg

5. Do steps 2 to 7 in the tutorial at the link below, and return.

Clean Install - Windows 8

6. Delete all partitions/volumes on the disk # (ex: Disk 0) that you want to install Windows 8 as UEFI on until that disk # shows as unallocated space. (see screenshot below)

Step7.jpg

7. When you are finished, click/tap on New, Apply (for full size of disk), and OK. (see screenshot above)

8. You will notice that the disk has now been formatted as GPT with 4 partitions. Select the "Primary" partition 4, and click/tap on Next. (see screenshot below)
NOTE: You might receive a "Windows can't be installed on drive 0" warning, but as long as you can click on the Next button, you're fine.

Note   Note
The 4 partitions are:
  • Paritition 1 - Recovery
  • Partition 2 - System - The EFI System partition that contains the NTLDR, HAL, Boot.txt, and other files that are needed to boot the system, such as drivers.
  • Partition 3 - MSR - The Microsoft Reserved (MSR) partition that reserves space on each disk drive for subsequent use by operating system software.
  • Partition 4 - Primary - Where Windows is to be installed to.

    It is imperative that these 4 partitions remain in the exact order as they are





setup.PNG

9. You can now finish doing the steps in either tutorial below.


10. That's it. You have successfully installed Windows 8 on a UEFI system.






Related Tutorials




External Links:


 

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m1midan0s

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Mar 24, 2013
Messages
5
Hello m1midan0s, and welcome to Eight Forums.

The tutorial below can help show you how to create a bootable Windows 8 installation USB for UEFI.

http://www.eightforums.com/tutorials/15458-uefi-bootable-usb-flash-drive-create-windows.html


Once created, you could use the tutorial on the first page of this thread to install with UEFI.

Hope this helps, :)
Shawn

Al right, thnx! I just ordered an 8gb USB stick (since I only had a 2gb lying around here) and I'll try again tomorrow.

Changed my hardware today and Windows 8 couldn't boot. After resetting windows 8 to factory settings it asked again to activate, which now it can't do, because according to windows my "license key has been activated more than the maximum". What's that all about?

Anyway, I'll be happy if I manage to get w8 installed with UEFI and afterwards I guess I'll give microsoft a call about that deal.
 

My Computer

System One

  • OS
    Windows 8 x64 Pro
    Name
    Daan van den Bergh
    Computer type
    PC/Desktop
    CPU
    AMD A8-3870K
    Motherboard
    AsRock A75M-HVS
    Memory
    Kingston 8GB DDR3 1866Mhz
    Graphics Card(s)
    Radeon 6550D On-board
    Sound Card
    AMD HDMI On-board
    Monitor(s) Displays
    Panasonic L32E5
    Screen Resolution
    1920*1080p
    Hard Drives
    Crucial M4 64GB SSD
    PSU
    Antec EA-500D
    Case
    Antec Fusion
    Cooling
    Scythe Ninja Rev. B
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    Logitech Wireless Keyboard M400
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Brink

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mvp
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Since it's a hardware change, you may need to do a phone activation.
 

My Computer

System One

  • OS
    64-bit Windows 10
    Name
    Shawn Brink
    Computer type
    PC/Desktop
    System Manufacturer/Model
    Custom self built
    CPU
    Intel i7-8700K OC'd to 5 GHz
    Motherboard
    ASUS ROG Maximus XI Formula Z390
    Memory
    16 GB (8GBx2) G.SKILL TridentZ DDR4 3200 MHz
    Graphics Card(s)
    ASUS ROG-STRIX-GTX1080TI-O11G-GAMING
    Sound Card
    Integrated Digital Audio (S/PDIF)
    Monitor(s) Displays
    3 x 27" Asus VE278Q
    Screen Resolution
    1920x1080
    Hard Drives
    1TB Samsung 970 EVO Plus M.2,
    250GB Samsung 960 EVO M.2,
    6TB WD Black WD6001FZWX
    8TB WD MyCloudEX2Ultra NAS
    PSU
    OCZ Series Gold OCZZ1000M 1000W
    Case
    Thermaltake Core P3
    Cooling
    Corsair Hydro H115i
    Keyboard
    Logitech wireless K800
    Mouse
    Logitech MX Master
    Internet Speed
    1 Gb/s Download and 35 Mb/s Upload
    Browser
    Internet Explorer 11
    Antivirus
    Malwarebyte Anti-Malware Premium
    Other Info
    Logitech Z625 speaker system,
    Logitech BRIO 4K Pro webcam,
    HP Color LaserJet Pro MFP M477fdn,
    Linksys EA9500 router,
    Arris SB8200 cable modem,
    APC SMART-UPS RT 1000 XL - SURT1000XLI,
    Lumia 1520 phone
    State/Region Flag
    us oklahoma

m1midan0s

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Mar 24, 2013
Messages
5
Since it's a hardware change, you may need to do a phone activation.

Just wanted to say thank you for everyone's help here at the forum. I had contact multiple times with the customer service, but they didn't even know what UEFI was.

Then, after realizing I could just run the Upgrade Assistant again to create the ESD-folder, I created the ISO with UEFI-support, did a clean install with the windows 8 upgrade CD and activated through the phone as Brink suggested.

Now I have Windows 8 booting lightning fast (7-10 seconds) from my Crucial M4 SSD with AHCI and UEFI enabled! Just like I wanted. :)

Thanks!
 

My Computer

System One

  • OS
    Windows 8 x64 Pro
    Name
    Daan van den Bergh
    Computer type
    PC/Desktop
    CPU
    AMD A8-3870K
    Motherboard
    AsRock A75M-HVS
    Memory
    Kingston 8GB DDR3 1866Mhz
    Graphics Card(s)
    Radeon 6550D On-board
    Sound Card
    AMD HDMI On-board
    Monitor(s) Displays
    Panasonic L32E5
    Screen Resolution
    1920*1080p
    Hard Drives
    Crucial M4 64GB SSD
    PSU
    Antec EA-500D
    Case
    Antec Fusion
    Cooling
    Scythe Ninja Rev. B
    Keyboard
    Logitech Wireless Keyboard M400
    Internet Speed
    30Mbps
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    Chrome
    Antivirus
    Avast Internet Security
    Country Flag
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Brink

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mvp
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You're most welcome m1midan0s. Glad we could help. :)
 

My Computer

System One

  • OS
    64-bit Windows 10
    Name
    Shawn Brink
    Computer type
    PC/Desktop
    System Manufacturer/Model
    Custom self built
    CPU
    Intel i7-8700K OC'd to 5 GHz
    Motherboard
    ASUS ROG Maximus XI Formula Z390
    Memory
    16 GB (8GBx2) G.SKILL TridentZ DDR4 3200 MHz
    Graphics Card(s)
    ASUS ROG-STRIX-GTX1080TI-O11G-GAMING
    Sound Card
    Integrated Digital Audio (S/PDIF)
    Monitor(s) Displays
    3 x 27" Asus VE278Q
    Screen Resolution
    1920x1080
    Hard Drives
    1TB Samsung 970 EVO Plus M.2,
    250GB Samsung 960 EVO M.2,
    6TB WD Black WD6001FZWX
    8TB WD MyCloudEX2Ultra NAS
    PSU
    OCZ Series Gold OCZZ1000M 1000W
    Case
    Thermaltake Core P3
    Cooling
    Corsair Hydro H115i
    Keyboard
    Logitech wireless K800
    Mouse
    Logitech MX Master
    Internet Speed
    1 Gb/s Download and 35 Mb/s Upload
    Browser
    Internet Explorer 11
    Antivirus
    Malwarebyte Anti-Malware Premium
    Other Info
    Logitech Z625 speaker system,
    Logitech BRIO 4K Pro webcam,
    HP Color LaserJet Pro MFP M477fdn,
    Linksys EA9500 router,
    Arris SB8200 cable modem,
    APC SMART-UPS RT 1000 XL - SURT1000XLI,
    Lumia 1520 phone
    State/Region Flag
    us oklahoma

dinkoh

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Joined
Apr 17, 2013
Messages
4
I'm at a loss here.

I'm in UEFI boot mode, secure mode off.

I've deleted all partitions back in LEGACY MODE when I installing Windows 8 PRO x64.

But, when I tried to do a clean install with UEFI, I get:

"No boot device available.
SATA 0: Installed
SATA 1: Installed
SATA 2: None
SATA 3: None
Strike the F1 key to retry boot, F2 to run the setup utility"


It seems that UEFI doesn't recognize my USB flash drive.


But, when I do Legacy BIOS mode, it recognizes my USB drive as "UEFI: SanDisk Cruzer".

Any thoughts?
 

My Computer

System One

  • OS
    Intel(R) Core(TM) i5-3330 CPU @ 3.00GHz
    Computer type
    PC/Desktop
    System Manufacturer/Model
    Microsoft Windows 8 Pro 64-bit 9200 Multiprocessor Free
    CPU
    Dell Inc. 0XR1GT
    Motherboard
    8.00 GB
    Memory
    (1) NVIDIA GeForce GT 620 (Microsoft Corporation - WDDM v1.2) (2) Intel(R) HD Graphics (Microsoft
    Graphics Card(s)
    (1) High Definition Audio Device (2) High Definition Audio Device (3) High Definition Audio Devi
    Screen Resolution
    (1) Generic- Multi-Card USB Device (2) ST2000DM001-1CH164

theog

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I'm at a loss here.

I'm in UEFI boot mode, secure mode off.

I've deleted all partitions back in LEGACY MODE when I installing Windows 8 PRO x64.

But, when I tried to do a clean install with UEFI, I get:

"No boot device available.
SATA 0: Installed
SATA 1: Installed
SATA 2: None
SATA 3: None
Strike the F1 key to retry boot, F2 to run the setup utility"


It seems that UEFI doesn't recognize my USB flash drive.


But, when I do Legacy BIOS mode, it recognizes my USB drive as "UEFI: SanDisk Cruzer".

Any thoughts?

Is the USB drive formatted to FAT32?

http://www.eightforums.com/tutorials/15458-uefi-bootable-usb-flash-drive-create-windows.html
 

My Computer

System One

  • OS
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    Desktops x 5

    Towers x 4
    Country Flag
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    uk england

m1midan0s

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Joined
Mar 24, 2013
Messages
5
I have one more question:

I installed Windows 8 in UEFI mode, but with an older BIOS without full Windows 8 support. ATM I didn't know all the UEFI settings, so I unknowingly installed Windows 8 in IDE-mode and with CSM enabled (which AsRock calls "Normal boot").

At that moment, Windows 8 booted in about 45 seconds. Which was slower than my "old" system with an Core 2 Duo E6750 CPU.

After I installed Windows 8, I updated the BIOS to version 2.00, which has full windows 8 fast boot support, and set the boot mode to "Ultra Fast" (which means CSM is disabled) and found that the SSD was running in IDE mode, so I changed it to AHCI (and made the necessary registry tweaks to be able to boot to windows).

At this point, Windows 8 boots in 23 seconds. Which is pretty great, but not what I expected, as AsRock claims the A75M-motherboards with UEFI support should be able to boot in less than 10 seconds.

Now, my question is: can I gain any more speed in boottime if I reinstall Windows 8 again with all these settings set beforehand?

My system specs can be found in my profile.
 

My Computer

System One

  • OS
    Windows 8 x64 Pro
    Name
    Daan van den Bergh
    Computer type
    PC/Desktop
    CPU
    AMD A8-3870K
    Motherboard
    AsRock A75M-HVS
    Memory
    Kingston 8GB DDR3 1866Mhz
    Graphics Card(s)
    Radeon 6550D On-board
    Sound Card
    AMD HDMI On-board
    Monitor(s) Displays
    Panasonic L32E5
    Screen Resolution
    1920*1080p
    Hard Drives
    Crucial M4 64GB SSD
    PSU
    Antec EA-500D
    Case
    Antec Fusion
    Cooling
    Scythe Ninja Rev. B
    Keyboard
    Logitech Wireless Keyboard M400
    Internet Speed
    30Mbps
    Browser
    Chrome
    Antivirus
    Avast Internet Security
    Country Flag
    Netherlands

Brink

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mvp
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m1midan0s,

I can't use the "Ultra Fast" option since I don't have a compatible graphics card, but it's still the same on my ASRock X79 Extreme11 mobo when I installed how you have it set now beforehand.

I'm thinking that claim is for if you use "Fast Startup" in Windows 8 with UEFI and use the hybrid boot/shutdown feature.

This subject is all for a new thread to keep this one on topic though. :)
 

My Computer

System One

  • OS
    64-bit Windows 10
    Name
    Shawn Brink
    Computer type
    PC/Desktop
    System Manufacturer/Model
    Custom self built
    CPU
    Intel i7-8700K OC'd to 5 GHz
    Motherboard
    ASUS ROG Maximus XI Formula Z390
    Memory
    16 GB (8GBx2) G.SKILL TridentZ DDR4 3200 MHz
    Graphics Card(s)
    ASUS ROG-STRIX-GTX1080TI-O11G-GAMING
    Sound Card
    Integrated Digital Audio (S/PDIF)
    Monitor(s) Displays
    3 x 27" Asus VE278Q
    Screen Resolution
    1920x1080
    Hard Drives
    1TB Samsung 970 EVO Plus M.2,
    250GB Samsung 960 EVO M.2,
    6TB WD Black WD6001FZWX
    8TB WD MyCloudEX2Ultra NAS
    PSU
    OCZ Series Gold OCZZ1000M 1000W
    Case
    Thermaltake Core P3
    Cooling
    Corsair Hydro H115i
    Keyboard
    Logitech wireless K800
    Mouse
    Logitech MX Master
    Internet Speed
    1 Gb/s Download and 35 Mb/s Upload
    Browser
    Internet Explorer 11
    Antivirus
    Malwarebyte Anti-Malware Premium
    Other Info
    Logitech Z625 speaker system,
    Logitech BRIO 4K Pro webcam,
    HP Color LaserJet Pro MFP M477fdn,
    Linksys EA9500 router,
    Arris SB8200 cable modem,
    APC SMART-UPS RT 1000 XL - SURT1000XLI,
    Lumia 1520 phone
    State/Region Flag
    us oklahoma

dinkoh

New Member
Joined
Apr 17, 2013
Messages
4
I'm at a loss here.

I'm in UEFI boot mode, secure mode off.

I've deleted all partitions back in LEGACY MODE when I installing Windows 8 PRO x64.

But, when I tried to do a clean install with UEFI, I get:

"No boot device available.
SATA 0: Installed
SATA 1: Installed
SATA 2: None
SATA 3: None
Strike the F1 key to retry boot, F2 to run the setup utility"


It seems that UEFI doesn't recognize my USB flash drive.


But, when I do Legacy BIOS mode, it recognizes my USB drive as "UEFI: SanDisk Cruzer".

Any thoughts?

Is the USB drive formatted to FAT32?

http://www.eightforums.com/tutorials/15458-uefi-bootable-usb-flash-drive-create-windows.html


Yeah, it definitely is. I followed those instructions above (twice). Does it confirm it when I do boot using Legacy mode, it does say UEFI: Sandisk Cruzer? But it doesn't recognize it when I boot in UEFI BIOS mode.

I'm not sure why it doesn't recognize my USB when booting.
 

My Computer

System One

  • OS
    Intel(R) Core(TM) i5-3330 CPU @ 3.00GHz
    Computer type
    PC/Desktop
    System Manufacturer/Model
    Microsoft Windows 8 Pro 64-bit 9200 Multiprocessor Free
    CPU
    Dell Inc. 0XR1GT
    Motherboard
    8.00 GB
    Memory
    (1) NVIDIA GeForce GT 620 (Microsoft Corporation - WDDM v1.2) (2) Intel(R) HD Graphics (Microsoft
    Graphics Card(s)
    (1) High Definition Audio Device (2) High Definition Audio Device (3) High Definition Audio Devi
    Screen Resolution
    (1) Generic- Multi-Card USB Device (2) ST2000DM001-1CH164

theog

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Joined
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Messages
5,591
I'm at a loss here.

I'm in UEFI boot mode, secure mode off.

I've deleted all partitions back in LEGACY MODE when I installing Windows 8 PRO x64.

But, when I tried to do a clean install with UEFI, I get:

"No boot device available.
SATA 0: Installed
SATA 1: Installed
SATA 2: None
SATA 3: None
Strike the F1 key to retry boot, F2 to run the setup utility"


It seems that UEFI doesn't recognize my USB flash drive.


But, when I do Legacy BIOS mode, it recognizes my USB drive as "UEFI: SanDisk Cruzer".

Any thoughts?

Is the USB drive formatted to FAT32?

http://www.eightforums.com/tutorials/15458-uefi-bootable-usb-flash-drive-create-windows.html


Yeah, it definitely is. I followed those instructions above (twice). Does it confirm it when I do boot using Legacy mode, it does say UEFI: Sandisk Cruzer? But it doesn't recognize it when I boot in UEFI BIOS mode.

I'm not sure why it doesn't recognize my USB when booting.

Do you have Secure Boot DISABLED?
 

My Computer

System One

  • OS
    ME, XP,Vista,Win7,Win8,Win8.1
    Computer type
    PC/Desktop
    Other Info
    Notebooks x 3

    Desktops x 5

    Towers x 4
    Country Flag
    UK
    State/Region Flag
    uk england

dinkoh

New Member
Joined
Apr 17, 2013
Messages
4


Yeah, it definitely is. I followed those instructions above (twice). Does it confirm it when I do boot using Legacy mode, it does say UEFI: Sandisk Cruzer? But it doesn't recognize it when I boot in UEFI BIOS mode.

I'm not sure why it doesn't recognize my USB when booting.

Do you have Secure Boot DISABLED?

I tried both way with secure boot disabled and enabled, and it didn't seem to matter.
 

My Computer

System One

  • OS
    Intel(R) Core(TM) i5-3330 CPU @ 3.00GHz
    Computer type
    PC/Desktop
    System Manufacturer/Model
    Microsoft Windows 8 Pro 64-bit 9200 Multiprocessor Free
    CPU
    Dell Inc. 0XR1GT
    Motherboard
    8.00 GB
    Memory
    (1) NVIDIA GeForce GT 620 (Microsoft Corporation - WDDM v1.2) (2) Intel(R) HD Graphics (Microsoft
    Graphics Card(s)
    (1) High Definition Audio Device (2) High Definition Audio Device (3) High Definition Audio Devi
    Screen Resolution
    (1) Generic- Multi-Card USB Device (2) ST2000DM001-1CH164

theog

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Messages
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Yeah, it definitely is. I followed those instructions above (twice). Does it confirm it when I do boot using Legacy mode, it does say UEFI: Sandisk Cruzer? But it doesn't recognize it when I boot in UEFI BIOS mode.

I'm not sure why it doesn't recognize my USB when booting.

Do you have Secure Boot DISABLED?

I tried both way with secure boot disabled and enabled, and it didn't seem to matter.

For better help with problems, Can you post your specs.

Filling out System Specs - Windows 7 Help Forums

System Info - See Your System Specs - Windows 7 Help Forums
 

My Computer

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    ME, XP,Vista,Win7,Win8,Win8.1
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    UK
    State/Region Flag
    uk england

dinkoh

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Messages
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My Computer

System One

  • OS
    Intel(R) Core(TM) i5-3330 CPU @ 3.00GHz
    Computer type
    PC/Desktop
    System Manufacturer/Model
    Microsoft Windows 8 Pro 64-bit 9200 Multiprocessor Free
    CPU
    Dell Inc. 0XR1GT
    Motherboard
    8.00 GB
    Memory
    (1) NVIDIA GeForce GT 620 (Microsoft Corporation - WDDM v1.2) (2) Intel(R) HD Graphics (Microsoft
    Graphics Card(s)
    (1) High Definition Audio Device (2) High Definition Audio Device (3) High Definition Audio Devi
    Screen Resolution
    (1) Generic- Multi-Card USB Device (2) ST2000DM001-1CH164

theog

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I tried both way with secure boot disabled and enabled, and it didn't seem to matter.

For better help with problems, Can you post your specs.

Filling out System Specs - Windows 7 Help Forums

System Info - See Your System Specs - Windows 7 Help Forums


Thanks for helping. I put in my specs.

Reset the Dell BIOS back to default settings.

Also are you using the Dell reinstall Windows 8 x64 DVD to make the USB drive?
 
Last edited:

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uffbros

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Messages
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I also can't get this to make a UEFI Boot USB. I have a Windows 8 OEM .iso image. I followed the directions on how to make this bootable flash drive and while it boots it doesn't say UEFI when I select my Geek Squad 8GB Flash Drive. It just says Geek Squad 8GB. I have done this like 5 times following exactly the guide. I use Power Iso to do the extraction. I am doing this from my Toshiba Laptop with Win 8 Pro on it. I am getting a new HP Desktop in a few days and will immediately wipe it and clean install but now I don't know????? I have used known working USB Flash drives as well..It's not that. Thanks for further advise.
 

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    Windows 8.1 Pro
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    PC/Desktop

NIJAVA2

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Need Help With Bios Setup Mode Windows 8

Hi

I recently purchased an Asus N56VJ with Windows 8 pre-installed. At first I was trying to downgrade to Windows 7, but could not get past the windows splash screen. Anyway, while I was trying to figure out how to install windows 7, I was messing around in the bios. I decided to just stick with the Windows 8, but my bios is screwed up. I do not have any boot configuration options anymore. I tried to flash my bios, but still the bios was still the same. I did a full reset on my machine, and still no change in the bios. Is there any way to get my bios options back to the factory settings with all the options? Thanks in advance for any help that can be provided.
 

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theog

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Hi

I recently purchased an Asus N56VJ with Windows 8 pre-installed. At first I was trying to downgrade to Windows 7, but could not get past the windows splash screen. Anyway, while I was trying to figure out how to install windows 7, I was messing around in the bios. I decided to just stick with the Windows 8, but my bios is screwed up. I do not have any boot configuration options anymore. I tried to flash my bios, but still the bios was still the same. I did a full reset on my machine, and still no change in the bios. Is there any way to get my bios options back to the factory settings with all the options? Thanks in advance for any help that can be provided.

Reset the ASUs BIOS back to default setting.
 

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NIJAVA2

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Tried that about a dozen times...doesnt work I'm attaching screen shots of my bios...
 

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My Computer

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  • OS
    Windows 8
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    System Manufacturer/Model
    Asus N56VJ
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BFsampson

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Identify UEFI on Win 8 Pro 64 bit DVD

New to Win 8 and this forum. Is there a way to look in (view files) a Win 8 Pro DVD and determine if it supports UEFI upon a clean installation on Win 8 Pro?

I ask because in the "Here's How" of this tut a Note in step two indicates some Win 8 DVDs may not support UEFI. At least that is my interpretation of the note.
 
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andydviking

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Jul 9, 2013
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When I installed windows 8 UEFI I inserted my disk and took the following steps. When Windows 8 install came to actual install screen. I 1.) hit ctrl+f10 2.) type diskpart 3.) type list disk 4.) type select disk 0 5.) clean 6.) type convert gpt 7.) exit

After that I just installed windows and it worked fine.

Is this method OK? Or does it cause problems?

Thank you for your time and great guide.
 
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My Computer

System One

  • OS
    windows 8 64 bit

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