There used to be a time where having Antivirus on your Machine, Be it a Mac or a PC was an option. Those days are gone. If your device is used by others. If it's accessing network resources. If it's accessing the internet. You are at risk. Running like that is like running without a seat belt. You may coast along fine but when you hit that wall it's going to hurt bad.
Call today for a free quote on implementing Webroot into your network today. Cloud based management that is monitored 24/7.