To configure UAC settings, open the Start menu, type user account control, and click to open User Account Control settings. ... Use a strong PIN or password to block unauthorized access, ...

Now click the 'System and Security' option and, in the resulting window (pictured below), you'll see a 'Change User Account Control settings' link. Click on this and the UAC window will appear. 2.

When trying to run “Computer Management“, if you receive a dialog saying— This app has been blocked for your protection, ... and then type UAC to find the User Account Control Settings.

Running the app through the Command Prompt can bypass the "This App has been Blocked by your System Administrator" message. However, you need administrator privileges to execute the command.