This has already been answered. Your antivirus is throwing a false positive:
http://groups.google.com/group/rubyinstaller/browse_thread/thread/4b0706a106739704/c158809962589f4f
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Luis Lavena
AREA 17
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Perfection in design is achieved not when there is nothing more to add,
but rather when there is nothing more to take away.
Antoine de Saint-Exupéry