Most often this problem could be due to extra particles that manage to somehow create themselves in the particles folder. Find your particles folder in the media folder and delete anything with _0, _1, etc. If this does not work, I'd suggest making sure FH is NOT in either of computer's Programs folders, and is a folder all its own (should see it when you click on the (C:) drive to go into it). That's about all I got so hope this helps.