Hey i today i ran to this issue when i disabled my User Access Control from windows registery.

if you have previously disabled it you can re-enable it from

1- registery editor : "Computer\HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System"

2- double click EnableLUA

3- set the value to 1

4- restart your pc (you must do that)

hope it works for you.