Sounds like it may be virus/spyware related. Please go through our guide:
http://www.techist.com/forums/f51/spyware-removal-guide-osiris-updated-8-18-2008-a-165828/
and post your logs here:
HijackThis Logs (analyze) - Computer Forums
http://www.techist.com/forums/f51/spyware-removal-guide-osiris-updated-8-18-2008-a-165828/
and post your logs here:
HijackThis Logs (analyze) - Computer Forums
