Well, there is some program with a 5-minute wait period that is incompatible with FSOne, on your computer. Maybe an anti-viral scanner waiting for "inactivity?
Your assignment, should you decide to accept, is to find that program.
Have you tried to press "Ctrl-Alt-Del" after it freezes to bring up the Task Manager? Take a snapshot of the "Processes" tab before launching FSOne, then again after it's launched, then again after it freezes. You should see which program is the offender.