you can run what you want - whatever makes you feel secure. I run windows defender because it is already installed and you can forget it. it updates and scans automatically. you should also run a companion utility for spyware such as the free version of malwarebytes. just remember there is not one antivirus that is 100 percent effective. as far as your specific question if windows defender is all you need for an antivirus. I say yes, but others have their own favorite antivirus so they will say no :-)
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