I added a friends PC to my network to do some work on it with the internet. Now its on my network and would like to remove it. It show up on the view network computers.

Pull your NIC card and boot the computer. Then shut it down and reinstall the NIC. It will then be gone. You can disable it by clicking on the icon and choose disable. Keep Smiling
It makes them think you're up to something...
It will probably disappear by itself in a short time.
