How to Remove Windows Defender
Windows Defender is a security utility meant to combat malicious programs, such as adware and spyware on the Windows Vista operating system. Windows Defender is integrated into the Vista operating system, meaning it is not a stand-alone program which can be uninstalled. Therefore, the best way to deal with Windows Defender if you do not want it to run, is to remove it from the "Start Up" menu and disable its functionality.
Instructions
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Disabling Windows Defender
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1
Click "Start," then "All Programs" and "Windows Defender."
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Click "Tools" and "Options."
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Scroll through the list of options and remove the checks from the boxes called "Use Real Time Protection" and "Use Windows Defender."
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Click "Save." After the saving the changes a pop-up will notify you that Defender has been disabled.
Disabling Defender at Startup
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Click "Start," then type "msconfig" into the search field and press "Enter."
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Click on the "Startup" tab in the system configuration window.
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Find Windows Defender in the list, remove the check, click "Apply," then click "OK." This will make it so that Defender does not start up when you start up your computer, and should increase boot speed.
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Tips & Warnings
* If you decide not to use Windows Defender, it is wise to run a third party adware and spyware blocker, such as Spybot Search and Destroy. * Completely uninstalling Defender from a computer would involve breaking into the operating system and risk system failure.