[TheBeanhacker]

type the following into cmd, if the eight digit number ends in a 2 it has been disabled, you mus replace it with a 0 to make all eight digits 0 which will re-enable it

reg export "HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System" "PATH\export_file.txt"

then type the following to import it back into the registry

reg import "PATH\export_file.txt"