Currently Being ModeratedNov 28, 2012 4:46 AM (in response to shawon13)
Use your brain instead of Anti-virus software. It works better and doesn't cause you any problems.
If you need to scan for possible Windows viruses so that you don't pass them on to Windows users, try ClamXAV.
See Thomas' Mac Malware Guide http://www.reedcorner.net/mmg/ for more information.
Currently Being ModeratedNov 28, 2012 7:39 PM (in response to shawon13)
Depends what you use, if you use Microsoft Office then its good to have something installed to strip a vius off files you have received from Windows contacts. Especialy in business you do not want to pass on a virus via Microsoft Office.
I use ClamXAV like Barney mentioned, its free and works just fine. There are commercial sollutions available but I found that ALL of them slow down my Mac's.
Currently Being ModeratedNov 28, 2012 7:47 PM (in response to shawon13)
While there are malware for OS X, the numbers of malware are not rampant as they are for Windows, meaning that daily updates and checks are currently not needed; however, with a good antivirus utility you can periodically check Mail attachments and clear out any Windows-based malware that might be present, along with the rare Mac malware.
Unfortunately "common sense" for computer usage is not all too apparent to everyone, so if you are in doubt about this then the best approach is to get a free and reputable antivirus scanner, and then periodically scan your system with it. You do not need to keep active and on-access scanning enabled, but either a scheduled weekly or monthly scan should be plenty (or simply periodically do it yourself).
Some that I recommend to use are the free iAntivirus from Norton, Sophos Home edition, and ClamXav, but there are others as well.