Okay mate, if your not goign to system restore.
And a keylogger says it has come up, can i suggest that if there is a backdoor trojan on your comp, somebody can just logg into all your accounts? You might wanna dissable that function and run norton 360 as you said, look at your internet drive and block out things that you havent seen, try remote monerting if you have it and back up important information now. As we speak sombody might be stealing your shit.