It says I dont have dnssd.dll installed.  what does that mean

I'm trying to get started on installing Airport.  Right away the Airport utility says I don't have dnssd.dll installed.  what does that mean?

Your Win7 computer is either missing or has a corrupted dnssd.dll file. It may also have a potential Registry error.
Please check out the following About.com article: Dnssd.dll Not Found Error Resolution for more information and steps you can take to try to resolve it.

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