One computer of 3 on a wifi network can't see the internet

I tried a no-no earlier this week and have had a serious problem ever since. I tried to share files over a AE wifi network which was also carrying a cable modem. Everything stopped working, but after considerable sweat, I got two of my three computers (both OS 10.3.9 working fine. My primary computer however does not yet have internet connectivity. I can turn airport on, and it connects up fine, but for some reason my computer thinks that the cable modem is plugged into the ethernet port, instead of the SE base station.
I have tried everything I can think of, and a few desperation measures but nothing has worked so far. I tried fixing permissions, trashing the internet connectivity plist, and every permutation of settings of things that I could think of. I have left the base station alone, since it is working fine with the other two computers which both enjoy internet connectivity.
Any ideas?

Sharing files over a WiFi network created by an Airport Express (which also happens to be sharing a cable internet connection) is not a "no-no". It should work perfectly. The mistake many people make is to assume they need to select the option from the Airport menu to "create a computer to computer network" - and that is neither necessary nor correct. That being said...
Open System Preferences->Network. Make sure the "Automatic" location is chosen. In the Show drop down box, select "Network port configurations". In the list that appears (a) drag Airport to the top of the list and (b) make sure the box next to Airport is checked. Then go back to the Show drop down box and select Airport. Under the TCP/IP tab, make sure you have selected to "configure using DHCP" and that all other fields are left blank. Then go back to your Mac's Airport menu (top of the screen), make sure Airport is turned on, and select to connect to your Airport Express wireless network.
Also - make sure that in System Preferences->Network->Sharing, that "internet connection sharing" is not enabled (just in case you messed with it when you were trying to set up file sharing).

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