Not sure what you have tried yet, so I'll suggest the first thing to try ...
The cable modem will have an ethernet jack on it for "LAN" - you will need an ethernet cable ... plug the cable into this jack .. and the other end of the cable into the airport extreme .. and then power up the airport extreme .. if the airport extreme is new, it will set itself up automatically .. if not new, it might still set itself up automatically - look for a green light on the extreme ... if you have a green light you should be in good shape
Of course your computers have to be in range, say within about 100 feet of the extreme to pick up its wireless signal.
In the MacBook, make sure Airport is turned on - in System Preferences under Network.
Your MacBook should figure things out all by itself and you should be able to connect to the Internet.
On the PC, you'll need a wireless card if you don't already have one ...
You should be able to use the internet simultaneously and each computer should be able to share files if you want to try that (file sharing is turned off by default on the Mac, not sure about the PC)
Good luck!
For AA speaker tapes and PA system help with feedback and echo, see my blog at
rexark.com
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