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Troubleshooting Microsoft® Windows® Defender Error 0×800

Trishna About Trishna

is a tech blogger and writer, constantly diving deep in the technology world. She enjoys writing on the different shades of tech – whether it is gadgets, apps, software or devices. When she is not writing or excavating technological findings throughout the internet, she is busy checking the latest apps and gadgets for herself…

Tips to Troubleshooting Error 0×800 in Windows Defender

Windows Defender features real time protection which is an effective monitoring system. It will detect and remove known spyware from the computer. Operating System is the fundamental platform that should be configured on a computer for its basic operations. There are different brands of Operating Systems and Windows is the popular one. Microsoft Corporation introduces efficient platform for the functioning of various programs in computer systems. Windows Defender is software that helps the user to protect the computer against pop ups, slow performance, and security threats caused by spyware and other unwanted software. The excellent user interface and greater compatibility are the attractive features of Windows Operating Systems. Windows XP, Windows Vista and Windows 7 are the recent versions in which the latter is the latest one. The innovative Operating System from Microsoft Corporation, Windows 7 consists of attractive features and applications. The operating system is generally installed in the computer by default and the user can remove it and put the new one by either clean installation or upgrade installation.

Following are the issue, reasons and tips to resolve error 0×800 in Windows Defender :

  • Issue
  • Reasons
  • Resolving tips


There are problems reported in Windows computers that the error 0×800 is coming on the start up and it will stop the Windows defender service. It is a serious issue as the spyware may enter the system as there is no real time protection by effective scanning. The display of the error message is the indication and on this message the user need to be careful. These issues may accompanying with the freezing and slow down of the computer.


The defective configuration may cause the Windows defender to fail while loading during the start of computer and the reinstall will probably fix it. Some undesirable third party programs running in the background may create the problem. It is nice to hear that Microsoft has designed unique error codes for specific issues with its operating systems and this code will be displayed as the error message. The error code will also able to hint about the causes for the trouble. The pirated version of the software and malware inclusion can also be considered as the reasons.

Resolving tips

A clean boot to check if any third party services running in the background may solve the issue. A system restore is the other resolving tip. For that, firstly right click the “My Computer” icon and select “Properties”. Now click the “System Restore” tab and click the “Turn off System Restore on All Drives” box. Then click “OK”. Finally click “Yes” to confirming the turning off for system restore. The rebooting may sometimes solves the problem.

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