Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Very disappointed

I've worked with Norton AntiVirus (the consumer product) and Symantec AntiVirus (the corporate product) for PCs and they're great.Unfortunately Symantec has dropped the ball when it comes to the Mac version of Norton AntiVirus 10 (NAV10).First off, NAV10 interferes with Final Cut Pro and causes overall system instability.Second, NAV10 "does work" with Intel Macs but it is not a Universal App -- meaning that it uses Rosetta and ultimately more memory resources.I would recommend ClamXav because it works plain and simple, however it is not "supported." I use my Mac for mission-critical work so I must stick with an anti-virus program that offers technical support like Norton AntiVirus. I use NAV10 and it "works" most of the time but I'd rather use ClamXav.