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Why do I receive the error message "Setup can not uninstall Windows XP because the necessary registration information is missing" when I try to uninstall XP?
John Savill
November 19, 2002
1 Min Read
A. You might encounter this error message when you attempt to use the c:windowssystem32osuninst.exe command and either of the following conditions exists on your computer:
The Undo folder isn't present on the system.
The Win9xundodirpath and Win9xundointegrityinfo registry values are not present in the HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindowsCurrentVersionSetup registry subkey.
The Undo folder is typically located at the root of the C: drive and contains hidden and system attributes. To view the folder from the recovery console or command prompt, you need to type
dir /ahsor set the folder permissions by typing
attrib -sh c:undoIf the folder is missing, you can't uninstall the OS.
If the registry information is missing, try restoring a previous registry backup. Again, if this information is missing, you won't be able to uninstall the OS.
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