Windows 8 and 8.1 Forums


UEFI Partition Wiped After Windows 7 Installation

  1. #1

    UEFI Partition Wiped After Windows 7 Installation


    Hello all. My first post on these forums. Hope I don't break any rules in it
    I'll try to be short and clear in describing my problem, but please bare with me here as it's not the simplest of issues (not to me anyway).
    I got a (at the time new) MSi laptop several months back with just a regular Windows 8 Core x64 on it and a UEFI boot system (or whatever is the name for "BIOSs"). At some point I had problems with the settings - I couldn't open any of my computer's settings - and I researched long and hard to no avail. So I installed Windows 7 32-bit (the only disk I had). Now, I'm trying to upgrade to Windows 8.1 Pro. I noticed that after the installation of 8.1 Pro my system was still running in 32-bit, so I made a bootable USB stick with the retail version of Windows 8 Core with no key just to get the system back to x64. It worked just fine. I cannot, however, boot in UEFI mode. I believe the partition got wiped somewhere in the Windows 7 installation. Whenever I enter UEFI by pressing the DEL button (I cannot see the UEFI firmware settings tile under the Troubleshoot option) I see the boot mode is LEGACY and when I change it to UEFI, save and reset, it doesn't boot, giving me a "No media found" error. I don't care about my settings/files as long as I get UEFI back with Windows 8.1 Pro running.
    I googled long enough to know I'm not going anywhere if I don't ask someone with expertise on this matter.
    My next attempt would be to try and install 8.1 Pro from USB stick, wipe all the partitions and hope the installer will create new ones. The reason this would work when it didn't before is because I had the OS running in x86 not x64 (which UEFI doesn't support). So maybe now that the system is back to x64 the Windows installation will restore the UEFI back to its original state.
    Thanks in advance for any solutions

      My System SpecsSystem Spec

  2. #2


    Central IL
    Posts : 3,468
    Linux Mint 17.2


    Yes that is correct, when you load a different OS on the hard drive. All previous partitions are wiped off of the hard drive. Only way to get it back, is to reinstall Windows 8.x.x.
      My System SpecsSystem Spec

  3. #3


    Posts : 1,875
    Windows 10 Pro Prieview x64


    Quote Originally Posted by SumCreepyDude View Post
    .
    My next attempt would be to try and install 8.1 Pro from USB stick, wipe all the partitions and hope the installer will create new ones.
    Absolutely that would work.
      My System SpecsSystem Spec

  4. #4


    Hafnarfjörđur IS
    Posts : 4,376
    Linux Centos 7, W8.1, W7, W2K3 Server W10


    Hi there

    1) Disable protected boot -- your system can still boot UEFI -- there's confusion on the Forums -- protected boot (requires UEFI) - windows keys are embedded in the BIOS and you can't boot legacy or other OS'es - even a standard Windows recovery disk. Disabling protected boot allows legacy boot (as well as UEFI boots). UEFI does NOT require protected boot.

    2) convert HDD to GPT - a requirement for UEFI boot.

    3) Now perform Windows recovery from your Windows CD - or re-install -- this will install the UEFI version without any more problems - you don't need to do anything unless the boot menu gives you a choice between the UEFI and non UEFI install.

    Cheers
    jimbo
      My System SpecsSystem Spec

  5. #5


    Posts : 879
    Windows 10


    edit:

    How to download and clean install Windows 8.1 -> link

    Here is info about UEFI Boot Mode (installing using the GPT partition style) and Legacy BIOS Boot Mode (installing using the MBR partition style): link

    Quote Originally Posted by SumCreepyDude View Post
    I got a (at the time new) MSi laptop several months back with just a regular Windows 8 Core x64 on it and a UEFI boot system (or whatever is the name for "BIOSs")

    My next attempt would be to try and install 8.1 Pro from USB stick, wipe all the partitions and hope the installer will create new ones.
    I have a Lenovo laptop with preinstalled Windows 8 (core) x64, but then I have made a clean installation of Windows 8.1 Pro x64.

    1. Create a Windows 8.1 64-bit USB flash drive.

    UEFI Bootable USB Flash Drive - Create in Windows

    To create a bootable UEFI USB flash drive using Rufus.
    - Connect your USB flash drive.
    - Click/tap on the browse icon and select your Windows 8.1 64-bit ISO image file.
    - Under Partition scheme and target system type, select GPT partition scheme for UEFI Computer
    - Under File system, select FAT32
    - Click/tap on Start.

    2. You don't need to change the default UEFI firmware (BIOS) settings.

    3. Install Windows 8.1 Pro 64-bit

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

    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)


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


    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)

    Last edited by genet; 02 May 2015 at 05:42.
      My System SpecsSystem Spec

  6. #6


    Posts : 2,627
    win8.1.1 enterprise


    I recently had to delete all all partition including the recovery partition on uefi laptop to install win7 ,and I had used Refus to create the thumb drive install for uefi ,it didn't work ,I could find no way around it but delete all partitions ,for me it didn't matter to lose all the partitions
      My System SpecsSystem Spec

  7. #7


    Sydney, Nova Scotia, Canada
    Posts : 6,490
    Windows 10 Education 64 Bit


    Quote Originally Posted by genet View Post
    Quote Originally Posted by SumCreepyDude View Post
    I got a (at the time new) MSi laptop several months back with just a regular Windows 8 Core x64 on it and a UEFI boot system (or whatever is the name for "BIOSs")

    My next attempt would be to try and install 8.1 Pro from USB stick, wipe all the partitions and hope the installer will create new ones.
    I have a Lenovo laptop with preinstalled Windows 8 (core) x64, but then I have made a clean installation of Windows 8.1 Pro x64.

    1. Create a Windows 8.1 64-bit USB flash drive.

    UEFI Bootable USB Flash Drive - Create in Windows

    To create a bootable UEFI USB flash drive using Rufus.
    - Connect your USB flash drive.
    - Click/tap on the browse icon and select your Windows 8.1 64-bit ISO image file.
    - Under Partition scheme and target system type, select GPT partition scheme for UEFI Computer
    - Under File system, select FAT32
    - Click/tap on Start.

    2. You don't need to change the default UEFI firmware (BIOS) settings.

    3. Install Windows 8.1 Pro 64-bit

    edit: Windows 8.1 installer (when you install Windows 8.1 from DVD/USB) does not accept UEFI firmware (BIOS) embedded Windows 8 product key and will not automatically install Windows 8.1 (core), so you can enter your Windows 8.1 Pro product key.

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

    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)


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


    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)

    If you don't install in UEFI Mode you don't get the EFI partition. That partition should be created automatically if you do the install correctly. And your BIOS is set correctly.
      My System SpecsSystem Spec

UEFI Partition Wiped After Windows 7 Installation
Related Threads
Hi guys, I recently bought a new SSHD for my laptop and after initial problems with trying to install Windows in UEFI, I turned to Legacy and that worked. But now when I change it to UEFI, it just comes up as "Operating system not found". :cry: Any ideas or solutions would be greatly...
Hi All, I bought a new Acer V5-572 Laptop which came pre-installed with Linux and BIOS was UEFI mode selected. To install windows 8.1, I made a installable USB of windows 8.1 and selected Legacy boot in BIOS to boot from it. While installing I formatted the harddisk completely using DISKPART...
Hello, First post and I wish it was under better circumstances. ** I think I've put this in the wrong section. Sorry. ** I have managed to wipe my Windows partition while installing the latest release of Ubuntu (v14.04). I've had my HDD split in two with both Windows 8 (updated to 8.1...
Hi, First of all, let me say that I understand written English, but very poorly written and would like to apologize ... Is it possible not to have the partition "recovery"? Because if you look at the two tutorials: - UEFI (Unified Extensible Firmware Interface) - Install Windows 7 with...
uefi installation of windows 8 in Installation & Setup
ok... i upgraded from win7 to win8... and now i got to know that win8 would boot even more faster if it has uefi configuration,but to my bad it wasn't enabled in my intel dh55pj motherboard bios... now how do i install windows 8 again with uefi config. ?? i really have no idea about the...
ok well this is a little complicated to explain so m gonna summarize it as much as possible. i have a HP Sleekbook 15-B002xx which came with a windows 8 OS installed already. due to some reasons, i tried to shift it back to windows 7. After many unsuccessful tries, i finally managed to install...
Hi I'm new to eight forums, I hope i can become a valued member soon. I purchased a laptop in Korea not long ago, i came with the option of Win7 or 8 but i chose to get it without an OS because I didnt want an OS in hangul. I installed Windows 7 on it and I've been using it fine ever since. Now...
Eight Forums Android App Eight Forums IOS App Follow us on Facebook