I was on AIM last night, when my friend, who is always sending me links to music videos and other things, sent me a link. Turns out, he didn't get to warn me, and it was a virus. I clicked it, because I thought it was another one of his stupid videos. I've run Ad-aware more than once now, but it keeps coming back. It sent links to all of the people on my buddy list.

What virus is this? Is there any way to get rid of it or is my computer pretty much screwed?