Dont think you will have problems with any AV on your computer, 4gb and x64 hint computer is fast enough.
Free protection has been optional for many years, nothing new in that. Especially passive prevention like thinking before you click has never cost a penny
If you want some highly active free protection check out Comodo
Free Firewall Antivirus Software Download by ComodoAntivirus part is not really super yet Ive been told but you can just untick during install. Use Avast, Avira instead. If you ask me it is insane for a normal private user. Fun to play with and probably good medicine for paranoia. But then again I dont see much point in 2 way firewall either. There is a lot more you can do to exclude world, check this
A light best of freeware breed HIPS do it yourself setup - Wilders Security Forumsor dont turn on computer... Browsers can be also be crippled to reach some higher level of surfing, Firefox has loads of extensions to protect you. Like NoScript - also above my head like in waste of time
If you dont want all that stuff running and spend so much time configuring then improve passive security. Think about where risk come from, 99% chance you can avoid (or check better) with free higher awareness, and use of free services like OpenDNS (block Adware and phishing categories in Dashboard), WOT
Internet Security | WOT Web of Trust Along with Windows Defender and AV you should be "safe enough". Regardless of UAC setting. WOT can be faster than SiteAdvisor, Norton etc. in warning against the typical malware domains or simply block stuff they dont know about. Is an extra layer of security if there is any risk you fall for such offerings. Dont rely on stupid AV to work. Doubtful you get same warning even if you paid for it. Find a site with bad domains and check with LinkExtend
Screenshots - LinkExtend - The Ultimate Browsing Tool see shot with safety.
Should you want to run a keygen.exe you dont before it has been send off to
VirusTotal Does this happen often then install their handy uploader, you can rightclick file and use send-to menu. This also will make you wonder of what to pay for. ESET will ignore what Norton and Avira catches or is it really a False Positive? VirusTotal shows why whatever product is nothing more than a safety belt and how much advertising lies.
Norton 360 has tons of features but only thing unique which you might find it hard to find free alternative for is "Norton™ Identity Safe" - your Norton Account checking input in forms right? If you even use it. May be free version of
RoboForm can help - or stop the online nanny thinking and use
Keepass
Dont forget Microsoft will release free AV this year so more reason to consider new subscription, not just for Norton. Cant buy 100% safety anyway and if you are one of those asking for trouble, you will get it no matter what you buy. Comodo package can lock you down though but really not for everyone.
Forgot about Malwarebytes - install from here
http://www.malwarebytes.org/mbam.php make a batch file and a new entry in task scheduler. Let it run weekly, daily or what you prefer. Windows Defender has build in scheduler so that you already have set up.
eh.. something like below should work, if I remember correctly it can have problem with just 1 mbam.exe line and too many switches. Copy lines into a mbamscan.bat file and place in mbam program folder - then make entry in scheduler. MBAM will only popup in your face if it finds something, else it goes to sleep. Point of this is yet another very passive layer, not needed perhaps but nm. MBAM is better than most AV with what it targets, this and a few other programs live high on the crappy state of AV products
"Useful supplement" if very polite. Cost nothing.
@echo off
start /WAIT mbam.exe /runupdate
start mbam.exe /minimized /quickscanterminate
exit