I use to use SFC when I had Win 98, but I'm damned if I can find it on Win XP. Could please tell me how to run it? I went to the site you listed, but I can't understand any of it.
I also went Add/Remove programs and removed AVG Anti spyware and d/l'd it again. Updated it and then ran a scan. It scanned the memory/processes fine. But as soon as it started to scan the registry files, it shut down the computer & rebooted.