Looks like you have a spyware infection which are typically not detected by antivirus programs as they are legitimate programs but are just a nuicance. They are typically installed when installing 'free' software from websites and most just track your surfing habits so they can display tailored adverts.
I recommend malwarebytes (malwarebytes.org) to get rid of rouge spyware and adware. Finds a lot of stuff antivirus programs miss and it's free. The paid version has realtime protection but the free one works great for one time removals. I used to use it when I worked in a PC repair shop & it removed a program that drove me nuts - random internet explorer windows would open diaplaying all sorts of crap even when I wasn't using the PC. All other programs failed to find it.
A word of caution though; back up your system first as malwarebytes removes even the most stubborn malware and if windows system files have been modified by malware it can delete the files somtimes rendering your system unbootable.
Last edited by Arokh; 10/05/12 08:55 PM.
