At windows start-up I receive the following error message:

APAGENT.exe - unable to locate component. The application has failed to start because dnssd.dll was not found. The airport extreme  is working fine with my dell vostro other than the error message. Any ideas to stop the message each time I log on? Thanks

Something must have deleted that dll.
Try downloading and installing AirPort Utility again:
Windows XP SP3, Vista SP2: AirPort Utility 5.5.3 for Windows

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