I am using the 64 bit version from here: http://www.graphicode.com/download/GC-Prevue ... http://c304152.r52.cf1.rackcdn.com/gcprevue_x64.zip is the direct link I got. I used a clean 64 bit Windows 7 VM with the latest Cameyo (it auto updated to 2.7.something). The virtualized app just pops up asking me which to run, the program or its help. Either selection has my test computer(s) think for a minute and then the process exits. No GUI ever starts.