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The Bonjour service is a program from Apple. It is a program that discovers computers and programs/devices on computers that are inside a computing network. It is supposed to make communication between apple devices more efficient. That being said, if you have any apple devices connected to the network, it wont hurt to keep it on the PC.
I suspect that the failure to be able to install it is that I have 32-bit Bonjour installed on my 64-bit Windows 7 PC, which I am only guessing happened during moving of files from my old Windows XP computer (by a third-party utility).