Third party antivirus software is often the biggest security hole in windows. This is because it consists of large bodies of unaduited code, with very poor engineering prcatices running with elevated privileges that does insane things like injecting itself into other programs.
Just google for window antivirus security holes and see the long history of security bugs in antivirus programs, many of them far worse than the viruses they are supposed to be protecting you from.
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