I believe I too am now having this problem.  I had a bug and removed it.  then a few weeks later, I lost my hard drive.  Chkdsk not not help your problems did not help.  So I got out a older hard drive and plugged into my laptop to clean it up was working fine,  within a few day it too failed.  Only would show the drive letter.  Today my external drive died.  Only showing the letter.  running now chkdsk G: /x /b showing 4 clusters bad also showing index, and usn journal with the problems.  Believe I seen this before the other 2 failed.  I used you tweek program on 2 of the 3 disk, and if I remember there was something about turning off index to speed up the sys.  Could this be killing my drives?  using vista.