Glad it worked okay! It is odd because it doesn't seem to affect all installations. I never had a problem on Vista with Illustrator CS3, which also installs Bonjour, but I disabled it on principle because I don't like unknown/unwanted services running. Fortunately CS4 doesn't install Bonjour as a service, so if you upgrade, the problem shouldn't recur.

I do think though that Adobe might have asked permission before installing it, because it isn't needed on Windows systems in the vast majority of cases. And they didn't even write it, it's an Apple product.

Steve