I was drawn to this post as I have been trying to install CS3 on a Windows 7 x64 machine. Although this thread is quite old now I thought this might help someone.
CS3 runs Apples Bonjour for windows. I found that when you install CS3 on Windows 7 or Vista machine a additional route is added to the default gateway. This 0.0.0.0 address issue allowed me to navigate to the local network but stopped me getting to the internet or any of my other subnets.
I found this thread and went down the route of uninstalling the Bonjour's associated files and services but for me it screwed my machine and I had to restore. In the end I found a thread that pointed out that the files installed by CS3, found in the 'Program Files (x86)\Bonjour' where dated 2006.
If you go to the Mac website you'll find the latest program for download in a x64 bit version. Install this over the top (no need to remove the current Bonjour files) and after a reboot you should find your network connectivity returns.