Windows 8 and 8.1 Forums


Dell laptop wont boot to windows after regedit mistake W8

  1. #1


    Posts : 14
    windows 8

    Dell laptop wont boot to windows after regedit mistake W8


    Hi everyone, this is my 1st post. I've been lurking for a few months for answer to general tech support issues and it seems if anyone can help with this issue they can definitely be found on this forum.
    So I decided to get a little too confident and tried to fix an issue with bluetooth on my Dell Inspiron 15 3521 (windows 8) by changing the object name of the RPC service in regedit in order to try to get it to log on with NT AUTHORITY\Network Service instead of local.

    I did that here ---> HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Servic es\RpcSs\

    Being the genius that I am I did not backup the registry prior to this, don't have the original windows disc (bought computer used) and never created a backup disk either

    CURRENT STATUS: When I turn on the computer I see the Dell logo, than windows logo as if it is booting the system and after I get a black screen and a lonely mouse cursor.

    On the 1st screen with the Dell logo has 2 options I can choose: F2 for setup & F12 for boot options

    In setup (F2) I can only view information and add/change HDD password

    In boot options F12 it says:

    Boot mode is set to: Legacy: Secure boot: Off

    LEGACY BOOT: (allows me to choose the options below)
    Network
    Hard Drive
    CD/DVD/CD-RW Drive
    Diagnostics (I ran the full diagnostics it gives no errors)
    Enter Setup (takes me to F2 menu)
    Peripheral Device setting OPROM setting
    Change Boot Mode Setting
    - This menu lets me choose UEFI Boot Mode, Secure Boot OFF & UEFI Boot Mode, Secure Boot On

    WHAT I'VE TRIED:
    -Tried both UEFI boot modes but obviously that isn't going to help
    -Attempting to boot in safe mode I tried good old F8 and than Shift + F8 going on at least 15,000 times, no dice.
    -A friend told me to try to power off the system just as the Dell logo screen finishes loading 3 times in a row and on the 4th boot it will go to automatic recovery mode. Sounds like an old Contra code for Nintendo to me but that didn't do anything
    -Called Dell support but product is not under warranty so they treated me like the ugly girl at the club

    I appreciate any advice or support on this issue. The laptop has always given me issues so I'm going to get something new, most important thing at this point is recovering data at least if I cant get it to boot

    Thank you!

      My System SpecsSystem Spec

  2. #2


    San Jose - California
    Posts : 2,847
    8.1x64PWMC Ubuntu14.04x64 MintMate17x64


    I assume you don't have a Windows recovery disk so if you wish, you can copy the registry from the backup.

    1. Download the ISO (160MB) :Slacko Puppy Linux . Click one of the link shown on screen shot #1 item #1.
    2. Create a bootable USB Using Rufus - Create bootable USB drives the easy way
    3. Boot from USB, the screen should look like the screen shot. From the bottom left of screenshot #1 item #2. The HDs mounted as sda1, sda2 ... and one of these is your C: Drive.
    4. Open 2 instants of your C drive as shown in screenshot #2:
      - Manouver to /mnt/sda#/Windows/System32/config/regback on the 1st Windows
      - Manouver to /mnt/sda#/Windows/System32/config on 2nd Windows
    5. Select everything in regback folder, drag & drop to config folder ->Copy, answer Yes to confirm
    6. Reboot your PC


    NOTE: since you made modifications in the BIOS, you need to set back to the way it was.

    Click image for larger version

    Click image for larger version

    Good luck !!!
      My System SpecsSystem Spec

  3. #3


    Posts : 14
    windows 8


    Thank you for this, I will try tomorrow and update the thread. I have a USB jump drive but I think its under 1gb should I grab something larger?
      My System SpecsSystem Spec

  4. #4


    San Jose - California
    Posts : 2,847
    8.1x64PWMC Ubuntu14.04x64 MintMate17x64


    Quote Originally Posted by tech9 View Post
    Thank you for this, I will try tomorrow and update the thread. I have a USB jump drive but I think its under 1gb should I grab something larger?
    As you can see from screen shot #1, it only takes 160MB so you are OK.
      My System SpecsSystem Spec

  5. #5


    You could also download a Windows PE iso and edit the registry directly back to whatever you changed it from...providing of course you remembered what it was. A Windows PE bootable usb will allow you to do the copy of the back config/reg folder as topgundcp suggest as well.
      My System SpecsSystem Spec

  6. #6


    Posts : 14
    windows 8


    Sorry if my post made me sound like I'm more knowledgeable about this stuff than I really am I have zero computer programming background and don't completely understand the terminology being used. I'm just a seeker of knowledge and enjoy learning new things so whatever I know is what I've picked up along my journey

    @topgun I've never used or created a bootable usb but I'm reading through the links of the iso file and rufus program that you sent me to understand as much as I can without having to ask you to hold my hand through the process. I think I'm getting a better understanding of how to do it but any quick info you can provide to point me in the right direction will be appreciated. I'm about to give it a shot here shortly

    @play2me If I need to do this option how exactly will I end up to where I can change the registry? I changed the object name of this folder HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Servic es\RpcSs\ to NT AUTHORITY\Network Service so I guess it would be whatever the default is there. Is that something common to most windows 8 devices? If not I probably wont risk it because I dont remember 100% what it was
      My System SpecsSystem Spec

  7. #7


    Posts : 14
    windows 8


    And now that I think of it, in boot options on the computer that wont boot there was no option for boot from USB, just cd/dvd. What do I choose? I hope Im not frustrating anyone here, sorry....

    A little browsing and I figured this part out, that is unless there's a better option
    Last edited by tech9; 19 Aug 2014 at 02:04.
      My System SpecsSystem Spec

  8. #8


    Posts : 14
    windows 8


    Just did topgun's method and I really thought it was going to work but it didn't. It very well may be because I did something incorrectly along the way so I'm hoping to try again once I hear from him again and maybe get directed better on things to make sure to do or avoid.
      My System SpecsSystem Spec

  9. #9


    San Jose - California
    Posts : 2,847
    8.1x64PWMC Ubuntu14.04x64 MintMate17x64


    After you download the iso, plug in the USB stick then run Rufus and follow the screen to create the bootable USB:
    Click image for larger version

    Next, reboot your PC and keep tapping on F12 to get the Boot Menu displayed. Fron the list, select your USB to boot from.
    Follow the steps in my previous post.
      My System SpecsSystem Spec

  10. #10


    Posts : 14
    windows 8


    I did everything you said. Keep in mind I can not access the OS on the Dell computer so Im creating the bootable drive from a different computer. After that im booting the program from the computer wont load OS
    I went all the way through exactly as shown in the post, copy and pasted the files. I exited and clicked yes each time. The letters for some reason were all very blurry and I couldnt see what I was reading so I assumed yes meant confirming the paste of the copied folders. Chose reboot and same problem. Thank you for helping I really do appreciate it

    Im thinking if I can access the command prompt than maybe I can reverse my registry mistake from there. Tell me if you think this will work please....
    I can get a iso of windows 8 32 which matches the OS on the broken Dell. I can boot from that USB it will bring up widows automatic repair where I can choose command prompt. I just dont know what to do from there

    I understand system restore would be a better option but Ive never been able to do system restore even when the machine was operating normally. I always got an error about the restore faiing when trying to scan drive E, which I guess is where my OS runs from.

    Your thoughts?
      My System SpecsSystem Spec

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Dell laptop wont boot to windows after regedit mistake W8
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