have Dell demension 8300 with a sata drive had serious registry problems. decided to peform a installlation repair using Reinstallton CD that came with Dell system"Windows XP Professional including service pack 2" System currently has Windows XP Professional service pack 3.
During installtion repair encounter error "The signature for Windows Professional Upgrade is invalid. The error code 800b0100. No signature was present in subject. ***** Fatal error**** Setu;p failed to install catalogs. This is a fatal error. The setup log files should contain more information.