How to Fix Windows Defender turned off by group Policy

When I try to access Windows Defender through the Start menu or via the Control Panel, I get a message.  This started when I install a crack software  with malware LOL.

"Windows is Turned off by Group Policy. Windows Defender won't provide protection against harmful or potentially unwanted software and it won't send you alerts because it is off. To protect your computer against harmful or potentially unwanted software, contact your system administrator to enable Windows Defender via group policy"


How to fix this ?
Just to regedit or Press windows Logo and Letter R to run the runbox   and type  regedit

Find this:

HKLM\Software\Policies\Microsoft\Windows Defender

If you see  any Value delete it!!