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#11
Norton Internet Security enjoys an excellent reputation, too. Starting with the 2009 versions, the program was rebuilt from scratch, making it simultaneously very light and very powerful on the computer. Trialware is available over here:
Download Norton Internet Security, Antivirus or Norton 360
Whichever antivirus software you choose to test, make sure your computer fulfils the minimum system requirements and that you remove any preinstalled antivirus software cleanly.
Happy researching ;-D