Try and Advanced Clean Boot of XP. Run Defragmenter again
HOW TO: Perform Advanced Clean-Boot Troubleshooting in Windows XP:
http://support.microsoft.com/?kbid=316434
Description of the New Command Line Defrag.exe Included with Windows XP:
http://support.microsoft.com/?kbid=283080
--
Ramesh - Microsoft MVP
http://www.mvps.org/sramesh2k
Microsoft Most Valuable Professional Program
http://mvp.support.microsoft.com
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Well, since you asked...
I have been trying to run Defrag on XP Pro for weeks without success. I
have tried everything posted in this NG. I run chkdsk /f, I then run chkdsk
/F /R, I run defrag from the command line, I have run it by right-clicking
on the drive and then Properties, Tools,... I run it from Compmgmt.msc, but
always the same behavior.
Whether I click on Analyze or Defragment, it goes up to 10% and then it
stops with the error message:
"(C

The connection to the defragmenter engine has been lost. Restart
Defragmentation."
No matter how many times I restart defragmentation, I end up right back here
:-(
A user in this NG suggested:
" Start/run, and type: 'sfc /scannow'
You need your XP CD ready on hand. "
So, I did that, inserted the CD when requested to do so, and after the
process finished (I think it finished properly, the window just closed, no
messages...) I tried to defrag, and got the same problem as before.
Do you have any other ideas?