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.
|Error code||Possible reason for error||What to do now|
|0x8004ff00||Another Windows installer may be running.||See I can't install Microsoft Security Essentials for more details.|
|0x8004ff06||You might have a newer version of the software installed.||You need to uninstall all versions of the software. The following articles can help you uninstall a program:|
|0x8004ff81||Malware might be stopping your security software from installing correctly.||Download and run Windows Defender Offline.|
|0x80070002||There might be a problem checking for updates.||See Windows Update error 80070002 for more details.|
|0x80070005||You might not have the correct privileges to continue with this action - you might need to log on as an administrator.||See Installation error 0x80070005 for more details.|
|0x80070490||Malware might be stopping your PC from installing or running updates.||Download and run Window Defender Offline.|
|0x80070643||This is a generic error code - there could be an undiagnosed problem with your security software.||Try uninstalling any other security software. Also see Community answer Installation error 0x80070643|
|0x80073b01||This is a non-critical error. Your PC is still protected.||Restart your PC or reinstall your security software.|
|0x80248011||There is an issue with the file on your PC that stores updates.||See error 0x80248011 for more information.|
|0х80508023||Malware might be stopping you from scanning your PC.||Run the Microsoft Safety Scanner then update your security software and try again.|
The table below has some common error codes that you might get when using other Microsoft security software. You can also try searching theMicrosoft Community Forums for help.
|Error code||Possible reason for error||What to do now|
|0x4ff02||Malware might have modified your antivirus or antimalware software - you might need to uninstall and reinstall your security software.||The following articles have more information about uninstalling a program:|
|0x80004004||You might be trying to use more than one real-time security product at the same time.||If you are already running another security product you might need to turn Windows Defender off. If you are only running one product, try restarting your PC.|
|0x800106ba||Windows Defender might not have updated properly.||See error 0x800106ba for more information.|
|0x80040154||There might be a problem with Windows Update.||You should reset Windows Update components.|
|0x80070070||You might not have enough disk space on your PC to install updates.||See Windows Update error 80070070 for more details.|
|0x8007007f||There is a problem with your security software.||You might need to download and reinstall your antimalware product.|
|0x80070032||Your software had a general failure.||You should check for available updates and try again, or try reinstalling your security product.|
|0x800700df||The file you are trying to download might exceed the allowed limit and cannot be saved - you might need to increase your file-download limit.||See 0x800700df: folder copy error for more details.|
|0x80070422||There might be a problem installing Windows updates.||See Windows update error 80070422 for more details.|
|0x80070424||There might be a problem installing updates.||See error 0x80070424 for more details.|
|0x8007042c||There might be a problem with your Windows Firewall.||See 0x8007042c error message for detailed troubleshooting instructions.|
|0x8007043c||A program you are trying to run does not work in safe mode.||Restart your PC in normal mode. You can also find more answers from the Microsoft community.|
|0x800705b4||There might be a problem with your antivirus update.||See Windows Update error 800705b4 for more details.|
|0x8007139f||You might be trying to use more than one real-time security product at the same time.||If you are already running another security product you might need to turn Windows Defender off.|
|0x80080005||Your PC might not be responding properly.||See Stop error code 0x80080005 for more details.|
|0x80080017||You might not be running Windows with administrator privileges, or you might have another security product enabled.||You should remove any other real-time security products, log on as the administrator, and try again. See Windows Defender: Error Code: 0x80080017 for more details.|
|0x80240016||There might be another installation in progress - you should wait for this install to complete.||See Windows Update error 0x80240016 for more details.|
|0x80240022||Your PC might have an out-of-date certificate.||Download any available updates. See Microsoft KB article 924123 for more information.|
|0x80240438||Your PC date and time might be wrong.||Set the clock and try again.|
|0x8024400a||There might be a connection problem between your PC and the Windows servers.||See Windows Update error 8024400a, 8024400d, or 8024400e for more details.|
|0xc8000222||Windows can’t update.||Run the Windows update troubleshooter and then Reset Windows update components.|
|0xc8000710||Your hard disk might be full.||Free up some drive space on your PC and try again.|
|0x8050800c||There might be a problem with your security product.||You should check for available updates and try again, or try reinstalling your security product.|
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