Basically this is what happened:
My old hard drive's Windows files got corrupted and therefore I couldn't boot from that drive anymore. No problem, right? I just bought a new hard drive and loaded Windows on that, setting my new hard drive as my boot drive and my old "corrupted Windows" drive as my slave drive.
Now, I wanted the files on my old drive (obviously; why else would I have put the drive back in my computer?) but the problem is that when I try to access my files through Documents and Settings -> then my folder with the name of the account, it says that access is denied. I can't reach the files on my old computer, because it was considered an "administrative owner".
I looked this up on Microsoft Help and it said to do some procedures that were available only on Windows XP Small Business Edition or something - the feature wasn't available on the Home edition, which is what I have.
Anything I can do to retrieve the files, other than reinstall Windows on that hard drive?