Avast Pro Antivirus
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Full user review
"Light on resources and dependable!"
I myself tried the commercial version and love the quick boot times..doesn't drain computer resources and is reliable anti-virus...have tried many and get very frustrated during boot time with updates and RAM hogs!
Technical support does have a chat line but I find they could have a bit more to improve this area...
Over all I'd feel very safe browsing the internet with this program...many shields and not a bad user interface. If used along side with Malwarebytes anti malware program your computer should be safe from threats. Both have great free versions as well that can be used to remove threats. Both commercial programs work great together!