If you delete the %systemroot%\Repair folder, you will
not be able to:
- Install service packs.
Service Pack Setup could not find the Setup.log file in your
repair directory..
- Create an Emergency Repair disk
Repair Disk Utility could not copy all files to the Emergency
Repair Disk. One or more files were not found.
Sam._ , Security._ , Default._ hives and the SETUP.LOG which are found in the
Repair folder are missing.
The only solution is to do an inplace upgrade of NT.
See HOWTO:
Recover from Deleting the Repair Directory and Setup.log