My FIL recently passed away and now his wife (77 yrs old) has to learn to use the Mac to pay bills and do on-line banking. They have been hacked before so she is panicking about cyber security and asked me to make sure her computer is protected. I took it to a local shop and they found and removed 23,000 security issues. I know very little about Macintosh. What is a good AV package for Mac? I installed AVAST on my PC recently and it took me 3 days to figure out why my printer wasn't working. I removed AVAST and the printer magically started working again. I think it was the built in VPN.