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Uninstalling Windows 8 Developer Preview

    General discussion

  • How to uninstall Windows 8 Developer Preview

    What you need:

    * Windows 7 Installation DVD or USB drive

    The Steps:

    Boot your computer to the Windows 7 DVD and click on Install now as shown below:



    2. Select your language and click next:



    3. Click the button for "Use recovery tools" and choose the Windows 7 installation, note the Location (C) or (D), etc.

    4. Select "Command Prompt".

    5. Prepare your keyboard to write the below :P

    6. Let's Activate the primary partition, let’s start with the following commands:

        Diskpart
        Enter

        Select disk 0
        * (In-case your preferred windows is on the primary disk)
        Enter

        List partition
        Enter

        Select partition 1
        * (In-case your preferred windows is on partition 1)
        Enter

        Active
        * (That will make the selected partiation active)
        Enter

    Okay, we are done making the required partition active using... Let’s quite:

        Exit
        Enter

    7. Using the bootrec command, we have to fix the MBR:

        bootrec.exe /FixMbr
        Enter

    8. And now we going to use bcdedit command to restore the system's boot list but first let's backup the old bcdlist:

        bcdedit /export C:\BCDBackup
        Enter

        c:\
        Enter

        cd boot
        Enter

        attrib bcd -s -h –r
        Enter

        ren c:\boot\bcd bcd.bck
        Enter

    9. Now we have to rebuild the Boot Configuration Data (BCD) list on the primary drive:

        bootrec /RebuildBcd
        Enter

        *** Scanning all disks for Windows installation.
        *** Please wait, since this may take a while...
        *** Successfully scanned Windows installation.
        *** Total identified WIndows Installation: 2
        *** [1] d:\Windows
        *** Add installation to boot list? Yes<Y>/No<N>/All<A>:

        Note that is the Windows 8 installation, so note the drive letter in-case you have installed Windows 8 on the local disk (D) and just write:

        N
        Enter

        Now, Bootrec will display the Windows 7 installation which will be c:\Windows

        *** [2] c:\Windows
        *** Add installation to boot list? Yes<Y>/No<N>/All<A>:

        Select this installation:

        Y
        Enter

    10. Finally, using bootrec, we shall fix the booting record to the primary disc:

        bootrec.exe /FixBoot
        Enter

    PS: As always, you're on your own & Windows support in-case there is any damage occured to your MBR!

    Goodluck :)

    Friday, September 16, 2011 11:17 AM

All replies

  • On Fri, 16 Sep 2011 11:17:20 +0000, ras-7 wrote:

    How to uninstall Windows 8 Developer Preview

    Note

    This procedure does not uninstall the DP and most certainly won't work for
    those who have overwritten their Windows 7 install with a Windows 8
    install. All this procedure does is replace the Windows 8 bootloader with
    the Windows 7 bootloader.

    In addition, if you'd originally installed Windows 7 to a clean,
    unpartioned disk, the bootloader would normally be on the System Reserved
    partition that gets created automatically. This procedure will change that
    default such that the bootloader is now going to be on a different
    partition.


    Paul Adare
    MVP - Identity Lifecycle Manager
    http://www.identit.ca
    You have a tendency to feel you are superior to most computers.

    Friday, September 16, 2011 11:26 AM
  • Overwritten windows 7 install = Dumb which mean -> Format the partition!

    Installing to clean partition doesn't reserve the original bootloader = Erased the master bcd -> revert to bcdBuild!

    Thanks for posting into the thread :)


    • Edited by Amro Raslan Friday, September 16, 2011 11:58 AM Editing
    Friday, September 16, 2011 11:57 AM
  • On Fri, 16 Sep 2011 11:57:29 +0000, Amro Raslan wrote:

    Overwritten windows 7 install = Dumb which mean -> Format the partition!

    Dumb or not, if you'd take some time to look through the existing posts on
    this forum, a ton of people have done this, and the subject of your post is
    technically inaccurate and misleading. This is not meant personally but it
    is what it is.


    Installing to clean partition doesn't reserve the original bootloader = Erased the master bcd -> revert to bcdBuild!

    Actually, again, you're wrong from a technical perspective. The Windows 8
    and Windows 7 bootload processes are very different. You may not have
    noticed, but if you choose to boot Windows 7 from the Windows 8 boot menu,
    your computer takes a while and then completely reboots before booting
    into Windows 7. My best guess, until I get a little more time to
    investigate fully is that during this process, the Windows 7 bootloader is
    put back into place, otherwise there'd be no reason for the reboot.

    All your process does is to get rid of the Windows 8 bootloader and
    replaces it with the Windows 7 bootloader, and as I said in my original
    response, it really doesn't do it correctly since you're also making the
    partition that Windows 7 was installed to the active partition, which for a
    default Windows install is not correct. In a default Windows 7 install, the
    active partition, the one that contains the bootloader files is the System
    Reserved partition, not the one with the Windows install files on it.

    You may ask why the above matters, well, consider someone who is triple
    booting between say Windows 7, Windows 8, and Windows Server 2008 R2. Your
    process will let them boot to Windows 7, however, it will not allow them to
    boot to their Server R2 install.
    Finally, your process is overly complex and involved. For those with a
    working system who simply want to remove Windows 8, the easiest process is:

    1. Boot to either Windows 7 or Windows 8 and in Advanced System Settings,
    change the default OS to Windows 7 and set the time out to 0.

    This changes the bootloader back to the Windows 7 bootloader.

    Depending on the speed of your system, you may notice a quick flash of the
    screen that allows you to choose which OS to boot. If this bothers you,
    then you can:

    1. Allow your box to boot to Windows 7.
    2. Log in and open an elevated command prompt.
    3. Type bcdedit.
    4. Identify your Windows 8 install and then select and copy the
    corresponding Identifier.
    5. Type bcdedit /delete <paste_the_Win8_identifier> /cleanup

    Format or delete the partition that Windows 8 is on.

    Done.


    Paul Adare
    MVP - Identity Lifecycle Manager
    http://www.identit.ca
    Remember the good old days, when CPU was singular?

    Friday, September 16, 2011 5:54 PM