I found a better clue of my problem using PartitionMagic: it looks like I'm getting "cross-linked" errors when I scan the disk for errors. But it doesn't seem to work when I try to fix those errors. "File: $LogFile:5,FRS #2", if I choose to delete this file, will it fix the problem? I know I have no file of this name on my hard drive. But just in case, I'll wait for more information before attempting anything. Here's a screenshot:
