I partially agree with Manish; I delete cookies using each browser's clear history. Security programs often flag tracking cookies - sorta kinda like Yellow Alert for every vessel that comes close to the Internprise. Both HitmanPro's Early Warning Scan and MBAM's rootkit scan often flag Microsoft and other No Danger / But Very Necessary rootkits [many should be whitelisted by now]. Avast and Avira sometimes coughs up thingies that are perfectly ok to install and run [mostly holdovers from XP era]. The aforementioned is one big reason that I have for setting each and every security program: 1) quarantine; if no quaratine - ignores.