Thanks for that brundle. First off the JKDefrag program itself seems to be unaffected it's the GUI which is throwing a wobbly. I uninstalled the GUI and downloaded afresh and got the same threat warning as soon as I unzipped it. Ran it through your VirusTotal link and it came up with 7 positives (nearly all different). I will just run with the basic program and forget the GUI until someone decides what is going on.