Thanks for the info. Unfortunately, I did not have the same experience. I created a new user account (limited), and had no trouble running the TD. I couldn't save a tournament (or preferences, etc), but that is to be expected, as it was attempting to write to the disk in C:\Program Files\... I imagine had I attempted to save a tournament in the "My Documents" folder of the new user account, I would have had no trouble...
Again, thanks, any new information like this is always helpful.