My computer is really messed up but it didn't come with any sort of disk…Its a Compaq. On the tower it says Compaq Presario SR1403WM. We bought it from a store. I think Best Buy or something but anyways it would be way out of warrenty by now. It has been years. I want to start it fresh (system restore wont cut it) and even if I did find a way to start fresh it didn't come with a windows XP disk to reinstall….My mom would have thrown the receipt away by now. HELP?