My OS is windows 7, and FSX is on it's own drive. I don't think it would matter anyway since I installed windows without additional user profiles, so I am always the administrator whether I select administrators rights or not.

Regarding ACE setting model=100, I've made it a special project of mine to sort that out. It's like an addictive crime suspense novel. I can't put it down. Must figure out "who done it".  ;D