Security Essentials and Windows Defender Problem in Win7/8/8.1

Here, this post will show you detailed Security Essentials and Windows Defender problem.

These users find their real-time protection turned off without their knowledge and virus definitions are out-of-date.

The problem is happening with some users, but not all.

For Windows 10 users, they seem to not be affected.

Besides, there are more reports of the same problem on Microsoft Social Technet forum and Reddit forum.

Troubled by the error the handle is invalid when trying to back up with Windows snap-in tool?

Here are 5 solutions to fix this problem.