XP 64 bit
I downloaded the latest version (v1.02.085) and when I was running it, it just disappeared during building file list or defragging depending on the sizes of the drive.
It seems that some bugs specific to 64 bit OS have been fixed, but for me, its operation got much worse.

Any ideas what's happening ?

Hi taka,
Try this and thanks for taking your time to help us.

You need to use this thread and submit the Defrag debug report.

Defraggler debug mode, What it is and how to use it...
http://forum.piriform.com/index.php?showtopic=12840

Thanks in advance for submitting you "debug" report
Good luck,
davey

Here is the debug report.
Hope this helps.

I installed Defraggler on 2 different 2003 server.
I noticed that when it defrag a system or database file (in use) when he try to write it, just disappear.

I also installed degraggler on some client: if the user have administrative account on the machine it works fine.... id the user is a standard use (without administrative priviledge) windows signal a system error.... if you ignore it defraggler just work.