Originally Posted by Alexander

Ok, when you boot your computer, did you also try to hold the F8 key on startup, and then selecting 'last known good configuration'?

Another "last-resort" option you have is to to a "Repair Install" from the Windows XP boot cd. But I honestly think you're going to wind up doing a clean install after you could recover your sensitive data.

Btw, I've never been a fan of any Norton Tools... they would add too many services, drivers and other crap to my system which I don't really want to see.