I have used other packages in the past like Norton or Kaspersky but I am now used to the McAfee system (I gave up using the free internet security systems as they do not work!), although these days McAfee nowadays needs less and less user interface, it works in the background. It is a large program which can slow your PC / laptop down when scanning, no more than others I think. I make sure never ever pay the RRP price (Â£70 plus), I got this one for Â£45, for 3 user from 365games, and I can't grumble Â£15 per computer.
It quick and simple to set-up.
Please also don't forget to disable auto renewal on your McAfee account!