Enable Windows Defender on Windows 7

Problem

Windows defender was not running and needed to activate it.

Solution

There is this nice youtube video explaining this process. Below is a summary:

  • Open Control Panel
  • Then Go to View by Categories and select Large icons:

Selection_999(1261).png

  • Then you should see windows defender at the bottom of the page:

Selection_999(1262).png

  • Once you click on it, it will ask you if you want to start it, click ok and you are good to go.

This program is blocked by group policy

Problem

I got this error when trying to enable windows defender from the control panel.

This program is blocked by group policy error message
This program is blocked by group policy

On doing some research it appears this may have been caused by a malware and a virus scan upon activating windows defender validated this suspicion.

Solution

The solution as shown in this youtube video was to delete policies from the registry. I did not use the batch file. Deleting the registry entries worked.

  • Reboot the machine and then press F8 as it is booting to go into safe mode.
  • Once its started from the start menu type Regedit to open the windows registry.
  • Then First create a backup of the registry by clicking File Followed by Export and save to a location of your choice.
  • Then Next delete the following registry entries. You can review this video in-case the screenshots below are not clear.
First regristry key to be deleted
First registry key to be deleted
Second regristry key to be deleted
Second registry key to be deleted
Third regristry key to be deleted
Third registry key to be deleted
Last registry key to be deleted
Last registry key to be deleted

References

How To Fix This Program is Blocked by Group Policy in Windows 7/8/10