(Sending this post again because a link was not working...)
Perhaps Option d) in this wiki works for you?: Uninstalling Microsoft Security Essentials From Windows 10 After An Upgrade
If not, perhaps option a) or b)...
You might want to read: Everything You Need to Know About “Reset This PC” in Windows 8 and 10
Yes, I also tried uninstalling it while making the uninstaller run in Windows 7 compatibility mode.
As for resetting the PC, that's not going to happen, I'll just wait for Microsoft to come up with a real solution at that point. It is their responsibility afterall.