Hello Dave
Thanks for your message.
I did that earlier today. I think the program itself is called Sea Tools (Seagate hard drive). I did two tests, a basic one, which it passed, and two advanced tests which it failed.
Does that mean that the hard drive is corrupt? If so, and I need to replace it, can I retrieve Windows using the Recovery disks I burnt through the Recovery part of the PC itself a while ago, or would I need a new Windows installation CD which I would also need to buy?
Thanks!