MS Essentials

My wife's PC just flagged up that its McAfee anti-virus protection runs out in 15 days time. Rather than renew it I decided to uninstall the entire McAfee suite of programs and instead install the FREE MS Essentials protection program. I have this on my own PCs and, as far as I can tell, it seems to protect them pretty effectively.  Like others have found, MS Essentials runs in the background in an unobtrusive way without undue overhead.