Not a bad idea, though, (this is totally my fault for not explaining better,) the players have been completely sucked into the game/Internet/whatever. This isn't like SAO where, though you are trapped in the game there is still a real you. The real you is now inside the computer, combined with a character. 

Still though, the virus idea is really good. I will definitely think about including it. Still unsure if I want a main villain or an impending threat without a body. What do you guys think?