Kaspersky.
Norton 360 is just their version of Kaspersky.
Now let's see if they can get it right.
Trend Micro is *okay*.
When I had a virus problem a few years back,the only online scan that found anything was Kaspersky.
The scans I did were with :McAfee,Trend Micro,Kaspersky,F-Secure and one other I forget.
Zero problems since Kaspersky.
I'm never ever going back,not a chance in h*ll.
Get the commercial version and you can scan drives from other computers [mounted as externals].