Follow the instructions to the letter in the link below. If you've got no internet connection on the problem computer, you'll need to download the removal tools on a separate, clean computer, copy them to a flash drive/CD, then transfer them to the problem machine.

“Expand” the post titled: "Please try this" at the link below:
http://www.cnet.com/forums/post/f742c795-5881-433b-a29b-6d758efe5cd3/

Hope this helps.

Grif