If this works, go to start and type in CMD right click on the CMD at the top search and run as administrator.
You should now see a black box with white writings.
If not, try going back the start and entering in CMD again.
If it does work.
Bcdedit.exe /set TESTSIGNING ON
Bcdedit.exe -set loadoptions DDISABLE_INTEGRITY_CHECKS
Hit the enter key.
This will allow you to boot without having to press F8 all the time.