How To Fix Windows 1. Update Error 0x. 80. Windows Defender is turned off or not working. Windows Defender acts as the first line of defense against any malware, spyware infections that might have affected your computer. Microsoft provides this free anti malware program to customers using Windows 1. Vista. It allows end users to schedule a scan or manually run a quick, full or custom scan. However, sometimes, a user may experience issues enabling Windows Defender application in Windows. He may find that his Windows Defender is turned off or not working. Also, if your Windows Defender disables itself automatically every time you start your Windows computer, or at any time randomly when you are working on your PC, here are a few things you may want to investigate. If you face problems running Windows Defender in Windows 1087, read this. Fix Windows Defender has been turned off it isnt monitoring your computer error. In the error hex codes there is a first part called the HRESULT values 0x0000XXX that shows the type of error. System error codes. The operation. This article explains you the troubleshooting procedure to resolve the same. You may receive a message Windows Defender has been turned off, and it isnt monitoring your computer. If you have another antivirus software installed, it will turn off Windows Defender. But if you do not and yet, then you might want to carry out the following troubleshooting steps 1 Check if you have all the latest Windows Updates installed, including having the latest version of Windows Defender and its definitions. This copy of windows is not genuine error is faced by many users in their Windows 7, 8 PC. Opera Mini 4.5 Browser more. Here weve listed multiple methods to fix this error permanently. Windows Activation Code 0X80070422' title='Windows Activation Code 0X80070422' />Did you uninstall any security software recently especially Norton or Mc. Afee If so maybe its partial uninstallation is causing issues. Use Mc. Afee Consumer Products Removal Tool or some antivirus removal tool to ensure that you have even removed its remnants. Have you checked your computer for malware Or did you just recover from a malware attackI suggest you download and run a stand alone portable antivirus scanner and run an offline scan from your USB or else use an online antivirus scanner service to scan your PC. Open Action Center and see if you can enable Windows Defender. Run services. msc to open Services Manager. Ensure that the Windows Defender service is started and set to Automatic. If Windows Defender Service Win. Defend or Windows Defender Network Inspection Service Wd. Nis. Svc  of Windows Defender keeps stopping, turning off or could not start,Re register the following dll files and see if it helps you. Run each command in an elevated command prompt one after the other and hit Enter regsvr. Run regedit and navigate to the following key HKEYLOCALMACHINESOFTWAREMicrosoftWindows Defender. Here ensure that the value of these DWORDS is 1 Disable. Anti. Spyware and Disable. Anti. Virus. If it is 0, then you will have to use our freeware Reg. Ownit to take ownership of these Registry keys and then change its value from 0 to 1. Extract Wise Installer Exe more. Reg. Ownit allows you to take ownership of a Windows Registry key using Administrator, Home Users or the current Logged On User account. It may also happen that Windows Security Center may prompt you to Check Settings for the Malware Protection, and when you click the Turn on now button, it may show an error that says There are no new definitions available to download for Windows Defender. It may be possible that the issue may have been caused due to an inconsistent WMI repository. Restarting the WMI repository should thus help resolve the issue. Open Command Prompt as an Administrator. Type the following command and hit Enter winmgmt verifyrepository. If you get a message WMI repository is not consistent, run the following command winmgmt salvagerepository. This will perform a consistency check on the WMI repository and resolve the issue. Restart your machine. Try enabling Windows Defender now. If you get the following message instead, winmgmt salvagerepository is failed, ignore this message, and again run winmgmt salvagerepository. This time, it should help. This post titled Unable to turn on Windows Defender offers some additional troubleshooting suggestions, which may also interest you. You may also want to check the Windows Defender error code you receive and see if any resolution is available at Microsoft. Read this post if your Antivirus protection has expired. You may also want to check out these posts which help troubleshoot Windows Defender problems Updated Ported from WVC.