Most percent virus spread to PC not Mac. If you get any email with attachment files from unknow or you know. If you noticed file has been attached with file name at the end of file such as .mim or .exe or anything, of course will not work on mac but I simple trashed it. Unless you are aware that your friend will send you any files. That will be fine too. Best ways to get files from your friend by using AIM or FTP.
I've never gotten a virus on my computers..to be more specific, not one that runs on Mac..I've only got stupid windows ones so I doubt there's any real danger out there...however, I could always be wrong...but I can't be stuffed getting and AntiVirus program..
This is starting to sound like a broken record....
I've yet to have a problem with virii in macs. Been using macs for about 15 years, and never bothered with anti-virus. I'm thinking of doing so now though, as it seems like we're getting more converts. Virus writers go for maximum impact, and with more people using macs, we could start to become a target. Norton will most likely do the job for you.
I have been uploaded a virus to my mac during Gameplay on BattleNet(Blizzard using Starcraft)
I suggest you get a firewall, thats all you really need.
The virii i was uploaded was called the 'Doom Virus" and the little bugger wiped every driver off my comp, needless to say it was a bitch to recover and has made me paraniod since. I now run MacAnalysis on my machine, and carry a copy of Norton anti virii on me harddrive, just in case.
Get the latest version of NAV for your system. If you want to be able to run utilities then get either NSW2, Drive10, TechToolPro and/or DiskWarrior. Some of those run under OS 9.x and some under OS X natively.