If your Microsoft security software 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.
The table below has some common error codes from Microsoft Security Essentials. You can also try searching the Microsoft Community Forums for help.
The table below has some common error codes that you may get when using other Microsoft security software. You can also try searching the Microsoft Community Forums for help.
I want to...
Remove difficult malware
Remove FBI/police lock screen
See and search the latest threats
Answer common questions
Fix update problems
See common error codes
Get the latest updates
Find the right security software
Download security software
Send us a malware file
Dispute a detection
Report a false positive
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