I had an issue over a year ago, I had clicked on a link for a quilting site when suddenly a very convincing 'windows alert' popped up saying I had a virus, and to download tah de dah de dah...well to cut a long story short, I had a write ol time getting rid of it, finally found a forum on google which recommend a free programme to download, it worked...the virus was called: antivirus 2009 or something like that so beware...wasn't from the quiltingboard, but it was a quilting related free pattern or something.....
Hope you get rid soon!