I have McAfee for a free trial which expires in five days and am thinking of Microsoft Security Essentials. McAfee always tells me in their scan reports they have eliminated one trojan. It's never more or less and there is never any mention of the elimination of spyware, adware or malware. Also, is PC Checkup any good? I really need something that can run without interferring with my other stuff and the smooth running of my laptop. Is there any better free anti virus programmes than Microsoft Security Essentials?