Windows 8 and 8.1 Forums


Registry is corrupt after uninstalling Avast

  1. #21



    Trying to Sith things out
    Bamberg Germany
    Posts : 2,290
    Windows 10 Pro 64 bit


    Have you tried repairing your boot loader? If you're using UEFI(which I would guess):
    source

    to recover the loader (BCD) configuration, you have to boot from the original installation Windows 8 DVD (or a recovery disk or a special EFI bootable flash drive) and open the command line choosingSystem Restore > Troubleshoot-> Command Prompt or pressing Shift+F10).


    Start diskpart:
    1 diskpart

    Display the list of disks in the system:
    1 list disk

    Select the disk with Windows 8 installed (if there is one disk in the system, it will have zero index):
    1 sel disk 0

    Display the list of volumes in the system:
    1 list vol


    In this example, you can see that the EFI volume (it can easily be recognized by its size of 100 MB and FAT32 file system) has the index volume 1, and the boot volume with Windows 8 installed is volume 3.

    Assign any disk letter to the EFI volume:
    1 select volume 1

    1 assign letter K:

    Close diskpart:
    1 exit

    Go to the bootloader directory in the hidden volume
    1 cd /d k:\efi\microsoft\boot\

    Recreate the boot sector on the boot partition
    1 bootrec /fixboot

    Delete the current BCD configuration file by renaming it (save the older configuration as a backup):
    1 ren BCD BCD.bak

    With bcdboot.exe, create BCD store again by copying the boot files from the system directory:
    1 bcdboot C:\Windows /l en-us /s k: /f ALL

    where C:\Windows is the path to the directory with Windows 8 installed.
    /f ALL means that the boot files have to be copied including those for UEFI and BIOS computers (potential ability to boot in EFI and BIOS systems)
    /l en-us is a type of the system locale. By default, en-us English (USA) is used.

    Now you have to restart your computer. Then in the list of bootable devices there appears Windows Boot Manager where you can choose desired operating system to start.

      My System SpecsSystem Spec

  2. #22


    Posts : 22
    Windows 8.1


    Thanks Cliff S. I've made some tentative progress following your guide, but before I go any further I just want some reassurance that I won't make anything worse! This is new ground for me and it is very daunting! If this does work - great! But if it doesn't , how easy will it be to go back to where I am now?
      My System SpecsSystem Spec

  3. #23



    Trying to Sith things out
    Bamberg Germany
    Posts : 2,290
    Windows 10 Pro 64 bit


    Quote Originally Posted by Jafaremraf View Post
    Thanks Cliff S. I've made some tentative progress following your guide, but before I go any further I just want some reassurance that I won't make anything worse! This is new ground for me and it is very daunting! If this does work - great! But if it doesn't , how easy will it be to go back to where I am now?
    Could you please wait. I Private messageda more advanced user to answer your question, I have personally never used BCD for UEFI (just MBR rebuild in Windows 7.
      My System SpecsSystem Spec

  4. #24


    A Finnish ex-pat in Leipzig, Germany
    Posts : 1,452
    Windows 8.1 Pro with Media Center


    Quote Originally Posted by Jafaremraf View Post
    ... but before I go any further I just want some reassurance that I won't make anything worse!

    Any more reassurance is certainly difficult to give. As always with computers, the best we can tell you is to say it should work without issues. From https://technet.microsoft.com/en-us/...(v=ws.10).aspx:

    Support for both BIOS and UEFI firmware

    UEFI is the next generation of firmware architecture that is designed to replace the BIOS architecture. The new Windows boot environment is designed for both BIOS and UEFI and uses a common data store that can exchange boot configuration information between the firmware, the boot loader, and boot applications.
    This support article is also a good reference: https://technet.microsoft.com/en-us/...or=-2147217396

    Kari
      My System SpecsSystem Spec

  5. #25



    Trying to Sith things out
    Bamberg Germany
    Posts : 2,290
    Windows 10 Pro 64 bit


    Thanks Kari
      My System SpecsSystem Spec

  6. #26


    Posts : 22
    Windows 8.1


    That's okay, I understand. If I want to try and resolve it myself then I have to take risks...... It's only because it's new to me that I'm being a wuss - and the fact that it's my 12 year old's precious gaming PC = loads of pressure!
      My System SpecsSystem Spec

  7. #27


    Posts : 146
    Windows 8 Pro


    Hi Jane.
    Try this simple suggestion
    In Admin Command Prompt type the following
    diskpart then select your disk then type recover.
    Good Luck.
      My System SpecsSystem Spec

  8. #28



    Trying to Sith things out
    Bamberg Germany
    Posts : 2,290
    Windows 10 Pro 64 bit


    Quote Originally Posted by Jafaremraf View Post
    That's okay, I understand. If I want to try and resolve it myself then I have to take risks...... It's only because it's new to me that I'm being a wuss - and the fact that it's my 12 year old's precious gaming PC = loads of pressure!
    OW! A 12 year olds...just starting the teen years, that can be brutal. Just read a litte more on the subject BCD and you should be good. It is a lot easier a/less complicated with the old MBR but UEFI has a ton of benefits.
      My System SpecsSystem Spec

  9. #29


    Posts : 22
    Windows 8.1


    Quote Originally Posted by dencal View Post
    Hi Jane.
    Try this simple suggestion
    In Admin Command Prompt type the following
    diskpart then select your disk then type recover.
    Good Luck.
    i don't know what this does, but it said The RECOVER command completed successfully. PC still doesn't work though! Think I'll have to try repairing the boot loader...... (Takes deep breath....)
      My System SpecsSystem Spec

  10. #30


    Posts : 2,690
    Windows 3.1 > Windows 10


    please get back into command prompt (either via recovery or setup media)

    Type> diskpart
    type> list disk
    type> list volume

    post a pic..
      My System SpecsSystem Spec

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