Have you ever heard of Microsoft Security Essentials (MSE)?
By default, this software is built on Windows XP,Windows Vista, and Windows 7.
That is to say, the Microsoft Security Essentials is replaced by Windows Defender in the newer versions.

However, Windows 8 and Windows 10 users can still choose to install this software manually according to needs.
[SOLVED] Windows Defender Deleted Files, How To Get Back Easily?
(MiniTool Solutionis a master at solving PC problems.)

yo remember to reset your rig after trying each method.
How to fix when Windows Explorer runs into a problem?
How to fix Windows Explorer needs to be restarted problem?
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This post tells you several methods to solve it.
What to do when your taskbar stops working?
Whats the biggest problem during the process?
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Some users reported they cant find the ProgramData folder in step 3.
How to show hidden ProgramData folder in Windows 7?
How to show hidden ProgramData folder in Windows 8 and Windows 10?

One: useTask Manager.
Two: use Computer Management.
Three: use Command Prompt.

Pleaseread this pageif youd like to use Command Prompt to recover lost files from your PC.
How to fix this issue?
(How to recover corrupt files?)

Method 6: Uninstall/Reinstall Microsoft Security Essentials
Dont ask me: should I uninstall Microsoft Security Essentials.
like figure out the answer yourself; whether it is necessary for your daily study/work or not.
Therefore, you definitely need to recover data from your PC.

Im not surprised when I found many people discussing the Microsoft Security Client OOBE stopped error on the internet.
Hope this page is helpful for you!
Microsoft Security Client Error FAQ


