If your Microsoft security software - like Microsoft Security Essentials, Windows Defender, etc, runs into trouble it will usually give you an error code to help you find out what went wrong. Most often an error means there was a problem installing an update. This post at Microsoft tells you what the error message means and also links you to possible Help posts.

Microsoft Security Software, Essentials, Windows Defender Error Codes

Visit Malware Protection Center for details.

Speaking of Error Codes, these posts are sure to interest you too!

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  4. How To Copy Error Codes & Messages From Dialog Boxes.