I’ve found a workaround solution to the problem. If I load the Task Manager and create a task that launches PP5.5 with “highest privileges” and create a shortcut to the task, then PP5.5 loads without any problems. This bypasses needing to launch it as another user and entering the domain admin credentials when I’m logged into the computer using my account.
I’m a little curious as what was changed in version 5.5 as I didn’t have this problems with PP CS5.