i have a edited version of windows XP professional on my computer. It always worked well, but in the past couple months it has been restarting without warning, no message comes up. It also has come more frequent. It doesn't matter what I'm doing, whether I'm just listening to music on windows media player or msn and a couple windows of internet up.

I've checked whether it's being overheated, and it's not.

can anyone help me?
Thank you for reading this.