Although there is no official way to cleanly uninstall Defender, it is possible to remove the service, Control Panel entry, other related registry entries and all the files and folders manually so Defender is unofficially removed from the system. This does present its own set of problems though as the registry keys, files and folders are all protected with enhanced permissions and you have to take ownership of them all. Also, once removed, you canâ€™t re-install Defender again because it isnâ€™t a separate package.
Simply download the portable Windows Defender Uninstaller and run it, then click the button to uninstall Defender. The lower pane will show whatâ€™s being deleted and if there are any errors. For best results, itâ€™s best to disable Defender beforehand using one of the methods above. Please use this tool at your own risk as once Defender has been removed, it cannot easily be re-installed, make sure you have backups to hand in case you change your mind later on.