> my brother had managed to install two 3rd-party anti-virus programs on top of Windows Defender Well, uhm, I knew for a fact that proprietary antivirus softwa

> my brother had managed to install two 3rd-party anti-virus programs on top of Windows Defender Well, uhm, I knew for a fact that proprietary antivirus software for Linux* makes the system unstable, and two of them will crash the whole system. I know that Windows has ELAM APIs, but I'm still impressed on some of my relatives' computer on how their computer still runs despite having McAfee/Norton and Avast (for example). * The kind that closely matches Windows' (aka with real-time scanning), not ClamAV scanning mail attachments.