A lot of the smart viruses and Trojan horses today try really hard and prevent you form going to the main anti-virus and "cleanup" sort of product including microsoft own tools. They actually block your access to those sites.
A couple of weeks ago my wife's laptop got totally infected (she must be browsing porn) and I ended up finding a little known program that did most of the clean up and then followed up with Microsoft tools that are available on their site and successfully cleaned everything with the exception of one item i had to get rid of manually.
Name of the product is Exterminate it. Worked pretty well.
http://www.exterminate-it.com/I then followed by subscribing to Microsoft's Live Care (I just installed the trial and didn't proceed with a paid subscription but that might something you want to do)
http://onecare.live.com/standard/en-us/prodinfo/default.htmA third product I used is Microsoft Defender
http://www.microsoft.com/windows/products/winfamily/defender/default.mspxYou will have to run these multiple times and reboot in between each cleanup. Also you might have to start your windows in Safe mode with networking enabled.
Hope this helps...and that would 100 Shekels pls, 1 Shekel for the time and work to post here and 99 for the knowledge of what to post.
...oh and stop browsing porn.