Hello all, Malware is a malicious software which is consists of three separate kinds of virus, worm and Trojan. An AV like Kaspersky does the defense against all the three. While Windows (say, 7) has built-in firewall, UAC, Windows defender and if we ourselves input one great AV like the above one into the OS, does the Windows need another running AM still? If yes, should all those defense tools be running along with the Windows always? Thanks.