i need help! my brothers computer is messed up. i think he has downloaded something bad. its a 98 windows hp with xp professional on it. everytime u turn it on, it gets were it checks your drive for mistakes and it stops and turns off by itself and reboots, and i cant turn it on safe mode or the last time it worked good i cant even get it to turn on, and i dont even no if he has his restore disc, what is wrong and what do i need to do. can i get a new harddrive and do that and make it new or what can i do.. THANKS