Maybe try getting a stronger anti virus, such as AVG pro, I believe they offer a free 30 day trail, and if you like it, you can buy it.
I personally use Nod32, which is extremely awsome, allthough the retail of it is 30.
After you've tried scanning everything and tried some other methods of removing it, you might just have to reformat all together.
Have you tried going into safe mode, and then scanning, or just going into safe mode and manually deleteing it?
Do you know how you got it? And when you got it?
Also, do you have the system restore enabled?
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