New plan to fix my computer:

Use Partition Magic to 1) Create a new partition from the free space on my harddrive. 2) Copy over some stuff 3) Repeat until backup is complete 4) Reformat and reinstall Windows on the remaining primary partition.

It may take a while, but I don't have to bother with buying and returning a new HDD, so that's a good thing.

Now, I just have to figure out why I can never have a bootable Windows XP disc, no matter how much I try. It's like a fucking curse.