OS - XP Pro with SP1 I was web surfing when McAfee caught a trojan horse, but it still re-set my IE hompage and then started crashing stuff. I was able to run Ad-Aware Pro several times (it crashed a few) and it found a bunch of stuff. Then I ran McAfee virus scan - it found some suspicious .exe's (but no viruses) on the C:/ root - I deleted them all. Finally my sys. locked up & after I tried logging back into XP - it would not let me. When it tries to 'loading personal settings' the PC clicks off to reboot - I see a quick blue screen that says something about a logon failure and gives a hex address - I can't pause it there to see it though. I kept trying to log-on, using F8 menu from Dos - tried all options - Debugging Mode finally worked - once I was in XP I ran Ad Aware again but PC locked up again. I kept trying to log-in - none of the Safe Modes work and now Debugging Mode will just lock the mouse up when I try to log-in. Finally i got logged-in using the 'Log in using Last Known working settings' or whatever the exact wording is -- once in XP I tried to use XP RESTORE to roll the system back a few days -- but again when it rebooted to put setting into effect, I can't log-in to XP -- back to the blue screen reboot. Apparently I have been told that some trojan horse has disabled all my XP profiles in the REGISTRY and that's why it will not load from the XP login screen - looks like winlogin.exe is messed up. Any ideas here? I would really like to repair this and not have to format my HD.