Sophos have a free version of their antivirus for mac : 
http://www.sophos.com/en-us/products/free-tools/sophos-antivirus-for-mac-home-edition.aspx

I don't know how much it'll slow the machine down but it's free.

Regards

Sam
MacAmbulance
Providing affordable Apple & PC services

Sam Mullen
07747 778022
http://www.macambulance.co.uk
[email protected]


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