Thanks for the suggestions. I have run Chkdsk/f as well as Chkdsk/f/r and defrag will just not work in either W2K or Diskeeper 7. Being at the end of the line I just formatted the drive and defrag is now working again. I will defrag after adding every software title or windows upgrade and report back if I ever find out where the problem came from. The last upgrade I made prior to noticing the problem was to IE 6, maybe this was the culprit. Thanks again for all the suggestions.