My desktop (with icons) appears, but none of my programs (such as defrag, internet connection, etc.) will run. I tried to uninstall SP2, but received a message saying "no". I tried to re-install Win XP Pro SP1a in a clean boot, and now my computer is stuck in setup. A message appears saying, "Fatal error: Setup failed to install product catalogs." (Other messages say, signature for win XP upgrade is invalid, cannot find text for message #0xfffffdda in message file for syssetup.dll, and that the CPU setting is incorrect.) I set the BIOS (including the CPU setting) to DEFAULT, with no improvement.
I tried to restart in Safe Mode without success (but it did tell me that I am running SP1). Right now, my computer hangs in setup, restarts, hangs in setup, restarts, with all the messages, above. The rescue disks didn't work--does anyone have any ideas?