Sorry to hear you are having trouble.
This is likely due to you installing Fence in a non-default location.
If after a purge, and a reboot, you still have Fences in your startup, right-click the Fences item in Startup and go to the file location:
Delete the folder that it took you to. Do the same for any other location for Fences.
See that Fences is no longer part of the Startup.
If its not, reinstall and try again.
Stardock Support Manager