You'll have to start in Safe Boot mode, fn+F8, or maybe just keep tapping F8.

To get rid of the virus though you'd have to have a CD ready with some anti-virus software to install. AVG Free is a good start.

Google xp log on log off loop to get more tips on removing the malware, could be a number of things.

Edited by Reboot (12/28/09 02:21 PM)