Windows Installer/RunAs shortcut

I have an application on a server in our domain; it's written in C# and uses the Word API. (The 开发者_如何学运维app runs through a list of medical reports, each a separate Word document, extracts information which it uses to alphabetize the patient on whom the report is made, and pushes the report content into a PDF.) The app appears to run fine when run directly on the server. It also runs correctly (using source code on the server) from Visual Studio on my machine. However, I don't want to allow the users direct access to the server. The solution I arrived at was to create a user with access to the server, then place a shortcut on the desktop which pointed to "runas $username $programname" . Up pops the authentication window, asking for the appropriate password. When this is supplied, the program executes correctly up until the point where Word is invoked; then it starts Windows Installer. I'm not sure what it's trying to install. If this is canceled, I get the following error: "Retrieving the COM class factory for component with CLSID {000209FF-0000-0000-C000-000000000046} failed due to the following error: 80080005." Am I doing something I shouldn't? Am I missing something?

I guess Word is attempting to do some kind of first use initialization or install repair.