Report Writer problem after installing .exe

Hello! I have an .exe that uses a data environment and various reports. The reports preview fine on my development machine. I created an install cd using the package and deployment wizard and installed the app on a users machine. The app works fine, but when the .show method is executed for any of the reports, I get an error that says "Application defined or Object defined error." and the report will not show. I checked the .dep file for the report writer msdbrpt.dll and found msstdfmt.dll and comcat.dll, both of which are on my users machine, same version. Any thoughts on what is happening here?