Attain 3.6a & Terminal Server 2003

I have installed Navision Attain 3.6a client on a Windows 2003 server, then activated the Terminal Server portion of 2003. Now when a client logs in everytime they go to use Attain it comes up with an install requestor. As long as I keep the client files on a cd in the terminal servers cd drive AND the user is an administrator, Attain will do a quick whatever and then come up. The problem is it does this every time. It creates the zup file as server login info is retained but... it still acts like it is doing a fresh install every time and if the user is not an admin it fails. I would really like to not have all my users set up as admins on the terminal server computer, but at the moment have no way around, does anyone have any ideas on what values or whatever need to be changed so Attain doesn't constantly think it needs to reinstall itself?

TIA