Do a scan for malware. Here is a list of malware scanners. Moderator Daifne's list of malware removers: * Malwarebytes' Anti-Malware - http://www.malwarebytes.org/mbam.php * SuperAntispyware - http://www.superantispyware.com/ * Spybot Search & Destroy - http://www.safer-networking.org/en/index.html * AdAware - http://www.lavasoftusa.com/software/adaware/ If these don't find it or can't clear it, post in one of these forums for specialized malware removal help: * http://www.spywarewarrior.com/index.php * http://forum.aumha.org/ * http://www.spywareinfoforum.com/ * http://bleepingcomputer.com/