Defraggler encountering a problem/shutting down

Just downloaded Defraggler and it runs for about 30 minutes then I get the windows "encounter a problem" window and needs to shut down. ran it twice still getting the "problem"

Is Defraggler not compatible with XP?

 

yes rebooted twice. downloaded from FileHippo. I will remove and try to download again. Is there a defrag (free) you recommend?

 

Hey.

I would not be without this:
http://www.mydefrag.com/

Please also know, even the most brilliantly written app for this needs some space to move things around. How occupied is your HDD on percentage basis?

Also know you must use only one, given each does what it does very differently.

But I have tested them all, and for me, the above wins hands down.

I run it every day before I shut a system down.