Need to reinstall Bonjour... Help

I mistakenly deleted Bonjour using the Control Panel. My OS is Vista. The very next day I got a new iPhone. I'm new to iTunes. I sync'd to my notebook, then went to sync to my desktop. Whoa! Some question came up that made me think syncing to multiple computers isn't just a snap. So I'm now very SLOWLY feeling my way through the iTunes Help file. That's where I discovered that I can share my itunes library across my network. Only... oops!.... I deleted Bonjour. So now I want to reinstall Bonjour. The directions say to uninstall iTunes and reinstall it to get Bonjour back. Only I'm afraid I'll lose songs I've purchased and songs I've imported into itunes. And I'm already confused enough.

** Can I just download an .exe for Bonjour and install it? If so, where can I find the .exe and in what directory should it be installed?

** And if anyone has any good suggestions on how to sync iTunes for an iPhone across 2 or 3 computers, please let me know.

Thank you for helping me.