Well, it's going to be very difficult to diagnose the problem if the only information we're given is "it won't connect". Can you elaborate on this a little? One of the first things to test in a network connection is pinging from a shell. In Windows, you can get a shell by opening the Command Prompt. In Mac OS X, open /Applications/Utilities/Terminal. From there, simply type ping xxx.xxx.xxx.xxx , where xxx.xxx.xxx.xxx is the IP address of the other computer. Hit Control-C to terminate. If it returns packets, there's a network connection.
Do the Macs work with each other? What are your IP address settings? Also, make sure you've disabled any firewalls when attempting to figure out the cause of the problem. These programs intended for ensuring your safety will often be the cause of mysterious network trouble.
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