I did move a large folder from the desktop of my XP drive to the root of the Vista drive (it was the entire ToCa Race Driver 3 folder) but that was quite a while ago.
It's weird that Chkdsk would suddenly decide to mess with my drives only now.
HEY! I just tested out something before posting the rest of this message and it turns out that it works fine if I move stuff in a folder in the root of C: but it messes up if I do it from a folder on the Desktop or in My Documents.
SO, it seems to only happen to files within C:\Documents and Settings\dentaku\
Hmmm... I'm slowly finding more and more about this situation all the time.