hmmm...I think it might be best for you to get checked out properly, this doesn't sound like just a corrupted file...
I would do a highjack this log and go to one of these sites for help, their experts in this type of thing and will walk you through a solution...
http://www.spywarewarrior.com/index.php http://www.bleepingcomputer.com/
Let us know how you go...
