Would system restore help? Just a thought. I don't know a lot about computers.

My other suggestions would be to download the free version of super antispyware. It's caught things on mine that norton etc. have missed before.
http://www.superantispyware.com/
It's a great product and I'm planning on buying the professional version of it once my norton subscription expires.

If that doesn't take care of it you might try Hijack This. It can be dangerous to use though since it can also remove things you actually need. http://news.cnet.com/Trend-Micro-acquires-HijackThis-antispyware-tool/2100-7355_3-6167308.html?tag=txt.4

I hope this helps! :)