I remoted-connected into someone's PC (using GoTOMyPC).
I attempted to install a program over there. Vista wouldn't run my installer. It just sat there, as if I hadn't double-clicked. I may have gotten an hour-glass for a few seconds.
So, I figured, it doesn't like my installer. So I manually copied the application over there. I then attempted to run the program. Again, Vista totally ignores my douible-click.
I did check and he does have Account Protection (or whatever it's called) turned off. Another situation required it be turned off.
I tired rebooting - no relief
I tried compatibility mode - no relief.