I picked up something off MSN today, and noticed things were acting strange. I scanned the two files I had downloaded (clean) and then deleted them. The computer would not hibernate, so I shut it down. The next reboot appeared to work fine. But when I ran Norton AV, it came up with some error - unfortunately I didn't look too closely what error, I panicked and decided it would be better to scan in safe mode. Trying to shut down at this point gave me a BSOD. Even more unexpectedly, when I tried to run safe mode, the system immediately logged out as soon as I logged in. Then when I tried 'Last known good configuration' and normal boot they had the same problem (immediate logout).
Sorry I can't provide more specific information, I'd like to run HJT but I'm a bit restricted now that I can't login.
Any help would be much appreciated, I guess the first thing would be how to log into Safe Mode?