I'm completely new to elvin - I just installed Mint the other day.
But what I understood from the answers to my similar questions, you don't really need an antivirus on you linux system.
I think it's mainly us "windozers" that think we do.
I don't know if you're dependant on Microsoft office, but if your really thinking about switching completely in the future, I would try out some of the linux alternatives to Microsoft office. They are quite good, and can read/write MS office files, with only a few exceptions. Open Office(free) is installed by default, and I like something called Softmaker Office(pretty cheap).
Just my 2 cents - good luck with mint.