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.
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