Norton works great in my experience, it's not what it was a few years ago. Light on resources, fast, and easy to use. A good alternative is ESET.
MSE did not serve me well, it let malware through on my parent's PC. I also had an unsatisfactory experience with Bitdefender on their PC, it simply stopped starting. I reinstalled and had the same issue. Switched to Norton ... no problems since.
2011 BMW E92 335i, 6MT, Le Mans blue - Quaife LSD, JRZ RS Pro, JRZ camber plates, Eibach ERS, full M3 susp, custom toe arms, Powergrid end-links, SS brake lines, brake ducting, Michelin PSS, UUC SSK, ETS FMIC, ER CP, Perf. Exhaust, VAC RSIK, Sparcos; work by VAC Motorsports in Philadelphia