Restore Registry

Microsoft Windows xp registry guide
August 9, 2009 at 09:19:37
Specs: Windows XP SP3, Athlon 64 1MB
I tried to change my system or boot drive back to C: from I: (Don't ask) in the registry. It didn't work and now Windows XP will not boot. I made a registry backup before I changed the drive. How can I restore the registry when I am unable to boot?

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August 9, 2009 at 09:38:34
Have you tried Safe Mode? Tap the F8 key constantly while booting. If it loads, restore the registry form there.

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August 9, 2009 at 12:49:03
I never have tried it, but it 'might' be possible, using a bootable Linux 'live' CD, to copy the registry files back. It depends upon how you backed up the registry.

Otherwise, if you have a MS XP CD, you could try a 'Repair Install' on the I: drive. But I'm not sure that would work.

Just so you know, what you tried to do is not possible.

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August 9, 2009 at 18:20:48
I tried Safe Mode and it will not boot. The repair function would not initialize. I'm down to your suggestion of using a MS XP CD. I only tried this because there was an article in Microsoft Help and Support (see following) that show you how to restore the system boot drive letter.

Article ID: 223188
Change the System/Boot Drive Letter

Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:
322756 ( ) How to back up and restore the registry in Windows
Make a full system backup of the computer and system state.
Log on as an Administrator.
Start Regedt32.exe.
Go to the following registry key:
Click MountedDevices.
On the Security menu, click Permissions.
Verify that Administrators have full control. Change this back when you are finished with these steps.
Quit Regedt32.exe, and then start Regedit.exe.
Locate the following registry key:
Find the drive letter you want to change to (new). Look for "\DosDevices\C:".
Right-click \DosDevices\C:, and then click Rename.

Note You must use Regedit instead of Regedt32 to rename this registry key.
Rename it to an unused drive letter "\DosDevices\Z:".

This frees up drive letter C.
Find the drive letter you want changed. Look for "\DosDevices\D:".
Right-click \DosDevices\D:, and then click Rename.
Rename it to the appropriate (new) drive letter "\DosDevices\C:".
Click the value for \DosDevices\Z:, click Rename, and then name it back to "\DosDevices\D:".
Quit Regedit, and then start Regedt32.
Change the permissions back to the previous setting for Administrators (this should probably be Read Only).
Restart the computer.

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