It's not your site man. They have the scumware coded to detect your page. Growing pains
Put a link up to one of the many nice free tools out there to clean up machines, and a disclaimer denouncing the scummer's actions, along with a brief explaination.
You don't
need the rev from the sales of a program like that, and SELLING one to infected surfers is gonna make you look guilty as hell. Don't listen to those penny pinchers trying to get their hands on every nickle over there
That's just greed talking. You'll make more from their loyalty in the long run.
AST