i have had a great experience with AVG Security, it's free version works fine, and is unobtrusive and quick, and LIVE~ if you want to do a little bit more,, use your search bar, next to the Start button, and delete all TEMP FILES , they are just left overs from downloads,, Also,, if you want someone reliable to give you the skinny on all things techogeek,, try a sited called KimKommando... she's very reliable and spot on! best wishes,, Gus