Vell,. vell... I've got Windows 7 and 8... I used Computer Associates for many many years, then Microsoft came out with their freebie... works great. Run it on all 9 of my machines... once in awhile I'll do a manual Spybot, and Malewarebytes scan, which rarely turns up anything... I see no reason to change... . Once in awhile it warns me about something, and I follow its advice... meanwhile, back to browsing the board... .
Mike