Viruses these days can do more than just spread.

They can also call home and completely compromise your local network.

And allow their creators full access to your compromised machine.

You ought to suspect that you are being hacked if your router reports that your PC is in continuous contact with a randomly named domain. No, we are not talking about Symantec, Microsoft, or Adobe. See picture:

You should also reset your wireless router, and clean your PC. Or hire someone to do so, which was what I did for the owner of this PC.

Hopefully he stopped downloading so much porn!