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1 Click Tools at the top of the Windows Defender Window. 2  Click Options in the Settings section of Windows Defender. 3  Click Default actions.  Set the default actions (recommended action based on definitions, Remove, or Quarantine) for each level of alert and then click Save.
Step 2: Navigate to Settings tab in the Defender and click on the Administrator section. Here uncheck the option Turn on Windows Defender and save the settings. Your Defender will be disabled instantly. If you want to enable Windows Defender protection in the future you can do that from the Windows Action Center.If you are looking for an antivirus that will work great on your Windows 8 computer, I have a nice suggestion.indows Defender is nothing but the free antivirus of Microsoft called the Microsoft Security Essentials clubbed with the Defender of Windows 7. Microsoft claims that Windows defender is sufficient for a home computer where mere basic protection is required, but I personally donât like it.