Hello,
What operating system are you using? Is it 32-bit or 64? Is your account an administrator?
Try the following (if applicable to your OS): Go to the FactorySQL installation directory, right click on “FactorySQLFrontend.exe” and select “Run as Administrator”. If that helps, it indicates that you’re on a machine with stiff security restrictions, and you’ll need to set the frontend and service to always run as administrator (from “properties” on the right click menu).
If that doesn’t help, you may want to reinstall the .net framework. Also, from what I could find online, there are some viruses that break the .net framework and cause this error. Basically, the error indicates a problem in the framework one way or another, either security, bad install, etc.
Regards,