Do a malware check with a few malware scan programs. You need to use all programs because each detects different malware. http://www.malwarebytes.org/mbam.php - Malwarebytes' Anti-Malware http://www.superantispyware.com/ - SuperAntispyware http://www.safer-networking.org/en/index.html - Spybot Search & Destroy http://www.lavasoft.com/products/ad_aware_free.php - Ad-Aware Free http://www.microsoft.com/windows/products/winfamily/defender/default.mspx - Windows Defender: Home Page .......... See also "Spyware on Windows": http://kb.mozillazine.org/Popups_not_blocked

I have the same problem, but I've also ran 4 different scans all from different anti-malware/spyware programs and its still happening. Using Windows 7 and I have AVG, Malwarebytes, Ad-Aware, and the general Wall that's already on my computer.