I installed Security Essentials and it causes Defender to stop the run.

* Original title: Security Essentials

I installed Security Essentials and it causes Defender to stop the run. The only way I can turn the Defender needs to restore my computer to before Security Essentials. I tried twice and got the same result.

Security Essentials replaces the Defender?

I am running Vista.

Thanks Len H

You are right.  MSE (Microsoft Security Essentials) in Windows XP, Vista and 7 can be used instead of Windows Defender.  They can not be activated at the same time.

https://blogs.Microsoft.com/Cybertrust/2013/11/14/Windows-Defender-and-Microsoft-security-essentials-which-one-do-i-need/

Tags: Windows

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