I am getting blamed? now what?

Yeah, I'd tell him that I didn't install anything on his computer, and I am not spying on him. If he is sure that someone is spying on him, then there must be a reason they are doing so. And that means he must be doing something he shouldn't be doing. And I really don't want to be a part of it. And then I would tell him to go away, and stay away, and don't call me again.