When you trying to open Group Policy Editor (gpedit.msc), Computer Management (compmgmt.msc), Services Manager (services.msc), Local Security Policy (secpol.msc), Device Manager (devmgmt.msc), etc. Windows showed following error message:
[User Account Control]
This app has been blocked for your protection.
An administrator has blocked you from running this app. For more information, contact the administrator.
Publisher: Unknown
File origin: Hard drive on this computer
Program location: "C:\Windows\system32\mmc.exe" "C:\Windows\system32\taskschd.msc"
Show information about this publisher's certificate
"Show information about this publisher's certificate"
Following screenshot shows the actual error message:

If you are also dealing with this error, follow the steps given below to fix “This app has been blocked for your protection” in Windows 10.

You can see video guide to fix this problem: “This app has been blocked for your protection” in Windows 10.

How to Do:
Step 1: Open Command Prompt as Administrator. After type: “secpol.msc”

Now, “Local Security Policy” windows appears.
Step 2: Please find "User Account Control: Run all administrators in Admin Approval Mode" via location as below: "Security Settings -> Local Policies -> Security Options".
Step 3: Double click to this value, and change from Enable to Disabled.
Step 4: Restart PC after changed setting.
Step 5: Finished, re-try to open services, apps.
With 5 steps, you may fix this problem. If you have any questions, please comment below. We will discuss and give the best answer. Thank you everyone.