Have to add users to the local administrators group to access an ASP .Net web app

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http://serverfault.com – I've got a particularly vexing issue that I can't quite seem to figure out. One of the devs here wrote a very simple web app that takes user input and sends it as a specially-formatted email to our clients. I'm running this on a DEV Server 2008 R2 box that's currently running the "beta" version of the next iteration of our internal app. What I'm running into is that any user that accesses the application has to be a member of the local Administrators group on the server - and by that, I mean they have to be in the group directly, not in a group that is a member of the local Administrators g (HowTos)