Unreasonable rebooting

I am a college student. My computer worked fine till I connected to the

campus LAN. My computer would reboot suddenly minutes after I logged in

Windows XP. I experienced six rebooting within an hour!!!

But when I plugged the cable off the network adapter, I have an hour of

peace with my computer.

When I loggin the safemode with network connection, the same thing hakppened.

When my computer reboot, it just turn into black screen, and did it, without
any preceding symptom.

Can you tell me what is wrong? Is it because of the network adapter?

Thank you all.

 

I'd have a chat with the college staff who look after the network. This could be symptomatic of there being a virus on the network, which I think they would want to investigate. It could be something wrong with your PC only, but if they have any sense the network administrators will assist you in determining that and discounting the virus/trojan likelihood.

 

Check in the event viewer for any clues. Start/Run eventvwr
May be a fault, or incompatibility with your NIC and the LAN. Update the drivers for your NIC.