Windows XP, removed bonjour in add/remove program. Now have an error message - APAgent.exe - Unable to Locate Component

Windows XP: removed bonjour by accident in the add/remove program. Now, everytime i log on, i get an error message that reads.

APAgent.exe - Unable To Locate Component

This application has failed to start because dnssd.dll was not found. Re-installing the application may fix this problem.

Tried reloading my Airport Extreme CD, but no luck.

Googled this error & got nowhere. How can i get fix this annoying error message?