what is a good anti virus for mac?

You!

...and keep java turned off.

Viruses, Trojans, Malware - and other aspects of Internet Security

Un-check it.

There's a bit more to this issue than just turning off Java. You should take a look at my Mac Malware Guide.

(Note that my pages contain links to other pages that promote my services, and this should not be taken as an endorsement of my services by Apple.)

The best antivirus software for Mac is Mackeeper and its available for download from Mackeeper, best antivirus software for Mac .

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I reccomend you read all the negative posts on here re Mackeeper

http://help.mackeeper.zeobit.com/Manual/GettingStarted/UninstallingMacKeeper.htm l

https://discussions.apple.com/thread/5486433?answerId=23531124022#23531124022

Sophos is best free for home use

http://www.sophos.com/en-us/products/free-tools/sophos-antivirus-for-mac-home-ed ition/download.aspx

Hmm, I wonder what motivates someone to post an ad for MacKeeper on a bunch of topics here that have been inactive for more than a year or two... Couldn't be astroturfing, could it?

http://en.wikipedia.org/wiki/Astroturfing

Please read the following in a voice dripping with sarcasm:

Oh, that's just ridiculous. They'd never astroturf. MacKeeper is known by all to be marketed with the highest ethical standards.

Cool - learned a new word!!