There are two antivirus program which I want to install on my laptop. I have a Hp Pavilion system which is working on a 64 bit operating system. I am using right not this as server at my office. Till yet it is a virus free pc and recently I had setup a ftp server for employees to share some common files. So there is a need for an antivirus now. I am stuck on this two antivirus program which one to choose among html. The first is Kasperksy 2011 and the second is Norton 2011. Which one to choose between them and what will you recommend. I found that Norton makes system too slow but it is a much powerful antivirus program.