Download this: http://www.safer-networking.org/en/download/index.html
You can run it from it's location. Then do a scan. I keep that and Adware. Use instructions on this screen. Sounds like you might have a virus, too. This might help
http://www.grisoft.com/us/us_remtext.php?id=bagbugnet
Also, there's a free anti virus program you can download there
Hope these help you