Since I installed the latest version I have not been able to get a full defrag of any HD. Stops at about 50%, says error has occurred and must close.. Details reference a \locals~1\temp\c5a2_appcompat.txt file.
Uninstalled and went back to older version, same notice and crash occurred again..
I am have the same problem, Deffragler gets to 54% completed (always) and I get the Must Shut Down message. Detail in the Window reporting window does refer to a appcompat.txt file. This problems has just started since I updated to the latest version of Deffragler in the last few days.