My dad recently bought a small mini tower. Pretty decent machine, but has low ram, a small hard drive and a crappy video card. Unfortunately he can't even use it. We have tried using a xp disk, and It now does a control on start up. So basically, you turn it on, it loads and goes to the "welcome" screen and BAM! Like that it resets. We have tried unplugging the ram, and it didn't work. So I need some ideas to fix this. Could replacing the hard disk fix it?