This is not the customary BSOD-analyst thing to say, but I suggest you forget about this one. I have seen BSODs occur during Defraggler and other defragmentation programs before, I haven't learned why yet.
The dump doesn't mention anything of significance, other than Defraggler was "on top" at the time of the crash; we knew that already though.
I see some drivers
that could use an update, but I'd be surprised if they were the cause of this.
My advice: stick with the Windows defragment tool, and if you get more BSODs, we'll go from there. Trying to troubleshoot this one is more work than I'm sure is worth to you. ...Summary of the dumps:
Built by: 7601.17514.amd64fre.win7sp1_rtm.101119-1850
Debug session time: Sat Mar 26 08:55:00.648 2011 (UTC - 4:00)
System Uptime: 0 days 3:26:50.146
Probably caused by : win32k.sys ( win32k!GreBatchTextOut+35 )