Free scanners exist for Mac and Windows. But I haven’t used Windows in ages so I'm not sure what's the best one these days.
For Macs (reviews are mixed but it'd better than nothing):
http://www.sophos.com/en-us/products/free-tools/sophos-antivirus-for-mac-home-edition.aspx
Sophos also have free tool for Windows (reviews are mixed but it'd better than nothing):
http://www.sophos.com/en-us/products/free-tools/virus-removal-tool.aspx
Tim Cimbura
Helping businesses become more effective, productive, and profitable through custom iPad/iPhone applications, FileMaker solutions, and web site design.
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