What is the problem if the compiter shut down after 2 min?

Well a couple of things usually will cause a computer to shutdown in that amount of time, first your power supply, or a temp sensor, thus a overheating cpu. To complicate matters Windows xp (before sp1) had issues with the network stack that could cause an overflow, and cause the computer to shutdown. These are the main things that may cause a computer to just shutdown, as vaug as that is. If you in need of more help, please send an email at aerowize @ Yahoo dot com -Rob