Originally Posted by
blueivy
Did you manage to fix this problem? I'm curious as to the outcome!
What Bobinovich said is right, check if the users accounts are Limited. The only thing I'd add is that if they are also Computer Administrator account types, get them to install the software too. It may ask you to uninstall or repair the installation instead of allowing you a straight install. In that case select repair.
You shouldn't have to reinstall and I doubt it will make any difference whatsoever but it's worth a shot as this is a strange one.