Thankyou DJ-Chris. I want to stress that although I really appreciate Lowndsey's help, I mentioned over and over that I don't have RAID and i'm pretty sure it had nothing to do with it but he kept talking about installing them. Words in CAPITALS for me is just to stress the word not express anger.
When we installed Windows XP, the 320gb hdd was the only one put in. Last night my brother managed to fix the computer... however, he needed to replace one hdd with another as they're only temporary while he gets the DATA off. When he did that, he got the problem again. If he swapped back to the hard-drive, where everything WAS working, the problem is still there.
I'm not sure what the drive letter of the Windows drive is. Thankyou
-Rhys