Can’t re-enable windows defender interface after uninstalling Norton

To ensure that another “Policy” has not been set, you should check this key in the Registry

“As an Administrator”

Hkey_Local_Machine\Software\Policies\Microsoft\ and select Windows Defender.

Any key in this folder other than Default is a policy that will affect the function of WD.

Expect to find DisableAntiVirus or DisableAntiSpyware. You can disable either of

these by modifying there Dword from 1 to 0. Do that by right-clicking the key name,

and select “Modify”. Type 0 and click “OK”. Exit the Registry.

All of these procedures should leave the “Virus & Threat Protection” option available again.