Ok, so I tried all the suggestions given, and they did NOT work. But I did find a solution.
I ran the troubleshooter for compatibility, and one of the questions it asked me was the previous OS it ran under, and if it needed admin privileges. Seeing this, I cancelled the troubleshooter and did the following:
1. Clicked on File Explorer.
2. Navigated to the location where the FPSC executable was.
3. Right clicked on the FPSC executable, and then clicked on Properties.
4. Click on the Compatibility tab, and then clicked on Change these settings for all users. (Note - I'm the only user on this machine)
5. Checked the box for Run this program in compatibility mode for, and then selected the previous OS in the dropdown (for me, this was Windows Vista SP 2).
6. Under Privilege Level, I checked the box for Run this program as an administrator.
I restarted my machine and launched FPSC. Voila! It works! I tested all functionality, and nothing is broken anymore.
Just thought I'd put the instructions out here in case someone else runs into this problem.
Priest of the Church of Joe Wood
In memory of Nanee. 9/1/1993 - 5/16/2009. Rest in Peace, little girl.