Yep, sounds like a virus to me. I'm not sure what would be the best way to fix that since you said you've ran anti-virus software and it didn't help. Try this site.
http://www.5starsupport.com They offer fast free tech support. All you gotta do is fill out the form explaining what's wrong and within a few minutes you'll start getting replies from different people. 'Cause the form goes to everybody in a particular group on 5 Star Support. They are really helpful and friendly. I strongly recommend you give it a try. It can't hurt. Let me know if you get it fixed. Good luck.