I run Windows 7 64 bit. Have had the system "freeze" symptom while running MEP. System thaws after killing all MEP processes. I put "freeze" in quotes because although the system response is VERY VERY slow, if you wait long enough you can bring up the task manager and kill the MEP processes without logging out. I have tried killing everything except MEP and could not find any other process that was interacting in a bad way with MEP. I currently am only running one very simple scheduled macro that periodically moves a file form one directory to another.
Rick