[chrisinthesun20]

it may be a boot-sector virus - but it seems strange that you said you got a message saying that your system is being shut down by the network administrator - this would suggest that either you are not logged in as the administrator, or someone else may have access to your PC.

I would suggest trying a USB mosue on your system if you can borrow/buy one, and see if you get the same problem, it might be a hardware problem with your PS2 port...