More: This may be caused by a third-party program (adware, spyware,
parasite).
Get AdAware and SpyBot and run them both. Keep them up to date.
Dealing with Unwanted Spyware, Parasites, Toolbars and Search Engines http://mvps.org/winhelp2002/unwanted.htm
you can also go to this website http://www.fixics.com.sg/indexEndUser.htm
and look for Free Virus Scan for HouseCall at the bottom right of the
page.I used it and it detected(and cleaned) the malware which caused
the problem. Now I no longer get the mediaticket popups.