Norton 360 is light on resources and very effective. Check out the independent lab results from AV Comparatives. People that diss Norton are living in the past... about four years ago when Symantec "did" tax the CPU. That's so yesterday. Norton and Kaspersky Pure along with Bitdefender are premier security suites. Sure... Avast, Avira, AVG, MSE, Windows Defender... they're all free and they're all reasonably effective. BUT when it comes to the best protection you can get... you get what you pay for and that means Norton, Kaspersky and Bitdefender as far as I'm concerned.