avoid Norton entirely.
Avast, Avira or AVG will do just as good a job and offer you a choice of free or paid versions.
Norton used to be the best but that was years and years ago (Windows NT had only progressed to NT 3.5 and by version 4 of NT Norton antivirus had managed to become the cause of many problems in Windows computers.
As a current example, should you let Norton AV expire or should you renew the subscription and have unseen problems with the renewal you thought went well, Norton shuts down your Internet access without warning you that it is doing so. That causes lots of hair pulling by end users and even a few monitors that become field expedient footballs.
Avast, AVG, and Avira all three tend to use less computer cycles than Norton too. I would suggest also installing MalwareBytes and Super Anti-Spyware for malware control but I suggest that even should you decide to stay with Norton. Of the Norton choices skip 360.
PS - for future posting please skip the upper case (it is like SHOUTING!) and break the post into readable paragraphs for ease of viewing.
I'M CURRENTLY RUNNING NORTON 360. I WANT TO KNOW IF THE 2013 NORTON INTERNET SECURITY WILL SLOW MY SYSTEM LESS THAN THE 360. I DON'T NEED THE 360 FEATURES. I WOULD LIKE TO TRY MICRO TREND TITANIUM OR KASPERSKY BUT HAVE A FEAR OF GETTING IN DOWNLOADED CORRECTLY AND HAVE HEARD GETTING SUPPORT IS KIND OF HARD. I'VE READ THAT THE NEW NORTON INTERNET SECURITY SLOWS YOUR COMPUTER LESS THAN THE 360 ALTHOUGH I CAN'T TELL MY COMPUTER RUNS SLOW OTHER THAN THE SLOW OLD PROCESSOR IT HAS AND I'M FIXING TO GET A BRAND NEW CUSTOM BUILT COMPUTER SO THAT WILL FIX THAT BUT MY 2 COMPUTERS THAT I HAVE LEFT WILL NOT BE BRAND NEW. ALL COMPUTERS RUN WINDOWS 7 EXCEPT ONE, IT RUNS XP. IT IS ONE OF THE COMPUTERS THAT WON'T BE REPLACED.
CAN ANYONE HELP ME DECIDE? I'VE BEEN WORKING ON THIS FOR 2 WEEKS AND AM DRIVING MYSELF CRAZY.