Hello Melissa,

I feel your pain. Some of the applications I wrote for automating MS Office last year have rebounded back to me due to this issue.
The scenario for me to overcome this is twofold. To run the apps under Win 7 (even logged in as administrator) was to right click on the app shortcut and select 'Run As Administrator'. The second was to instruct the individual how to run the application (without reducing the security level).

In your scenario this is going to prve a challenge. But there is a proviso within Win 7 to reduce the level of UAT.
Control Panel | System and Security | Action Centre (choice) change user account control settings (link). Reduce this using the slide bar and attempt anothe uninstallation.

Good luck and kind regards

Steve