>You are trying to strangle your users.... what specifically are you afraid of???
I realize this is a rather late reply, but welcome to the world of "managed" PCs. This is very, very common in restricting users and normally for good enough reasons. It's a different world when you're supporting 10,000 PCs vs 10. If 10 users (in the same office/location) buggered up their machines because they have full admin rights, it's probaly a lot easier to fix compared to fixing hundreds of PCs, often all over the globe.
Where I work, most of us do have full admin rights (and rarely screw up our PCs) but if I didn't, and I submitted a help-desk ticket requesting admin rights in order to run Inventor, it would be denied. I could escalate it and tell them it's necessary but without something from Autodesk stating admin rights are req'd, I wouldn't get it. Security comes first .... yes, even if that means not using my PC !!!