assuming this is XP, right click my computer, goto properties, advanced, startup/recovery, remove the check from restart after system failure. Then goto start, programs, administrator, event viewer.
Click the tabs on the right, and see what each error says, Should give you info, but ive tried using it before and its pretty inposiible! Just go down to the bottom, or maybe the top, to the most recent error, and see what is says.
nah, it can be useful. use technet if avail, if not search for the event id and the error and it will give a likely cause. check the application, and also system and security. look for something around the same times the error occurs, dbl click it and copy the error. check other errors, too... even though they may say the same the error/event ID may be different.