Updated build14965 to build 14971 and all went fine, I thought.
In the tray I see the Windows Defender icon with a red x.
I've gotten two different error codes 0x8007005 and 0x800705b4.
I checked the DinDef service and it's set to automatic.
When I push start it just won't run.
I have no other antivirus software installed.
Fixed by reinstalling over its self.
I had kept the install.esd from the original update and made an .iso file which worked perfectly.