Need to really drop UAC in Windows 10 to install big boy security software such as Check Point Endpoint with FDE.
In Windows 10 the UAC slider does not actually disable all the protections. Sometimes you have to go deeper.
Here is how you go deeper
regedit
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System
EnableLUA
0
Make sure you don’t leave it in this state. Do what you need to do, then slide that UAC slider all the way up on your way out.