Is there a free downloadable virus protector for my macbook?

Hello.  I want to know if I need virus protection on my mac.  If I do, is there free downloadable  software available?  I am 64 and on fixed income with a monthly deficit.

Yes there is: ClamXav from  http://www.clamxav.com/ 
Whether or not you really need it, and why, can be discussed at length, and is here:
https://discussions.apple.com/docs/DOC-1848
Regarding MacScan, First update the MacScan malware definitions before scanning. You can also contact their support team for any additional support - [email protected]
[b]Security of OS X generally:[/b]
http://www.apple.com/macosx/security/
http://www.nsa.gov/ia/_files/os/applemac/I731-007R-2007.pdf
Security Configuration for Version 10.5 Leopard:
http://images.apple.com/server/macosx/docs/Leopard_Security_Config_2nd_Ed.pdf
This Blog entry is also worth a read:
http://blog.damballa.com/?p=1055

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