I have been involved in a few threads where shell mvp's were trying to fix similar corrupted window installs, because of the older install media and loss of data, a clean install was a last resort. Running a repair disk was considered out of the question also. After several days and a few pages of posts it was found that my original suggestion of slipstreaming the latest service pack into the cab files was the only solution
and running windows as a repair disk. Sometimes even that doesn't work.
Have you tried creating a new admin from safe mode?
Edited by DaChew, 04 September 2008 - 03:38 PM.