I have given a chance to Kaspersky, tested it for 30 days and my system was slow in those 30 days I quite liked it! Just did not like the fact that he left my heavy system ... It is a great antivirus software, so this more than clear.
Already saw systems running beautifully with Kaspersky, I do not know why he left my slow system: /
Maybe in the future I give another chance for him! Today I am more than happy with ESET Smart Security, I do not intend to change anytime soon! For ESET is more than I expected!
More Kaspersky's there, knocking at my door one day give a second chence to him one day ...