Problem with WinXP/Vdub

Well, I bit the bullet and decided not to reinstall Linux when it was erased by the computer tech people. Instead I got windows XP.

Whenever I boot, it sometimes randomly restarts. When I start up Nandub, when starting to write an AVI, the computer restarts. When I start up VirtualDub, while writing an AVI, Windows will give me a “Not Responding” message, and then close it by itself. With VirtualDub, it will happen at random times during the AVI creation process, but usually towards the end of encoding.