Hard drive cant boot

If you're running Windows XP, put your Windows XP (or recovery) disc in, load Windows Setup, then press R for Recovery in setup.

You'll be asked eventually which installation of Windows you want to use, it's usually 1. It'll ask for an admin password, if you haven't set one, hit enter.

Then type "fixmbr" and confirm the action. Restart, then that should sort your problem.

Try booting up your XP cd and enter R at the first option screen. Type chkdsk when you get the dos prompt. This will check to see if the drive is crashed.