Here's a question: Is that your linksys, or the Cable companies?
If it's yours, and you can log into it (use one of the computers that has internet access to open a web page to the gateway, which is usually 192.168.1.1) The default login is admin for both user and password.
Once you're in, look at the top of the web page, there will be grey boxes with words in them, which will read setup password, status, DHCP. CLick on the DHCP, and make sure that that's enabled, AND make sure there's enough addresses for the number of computers you're using (I usually setup about 20 addresses minimu.)
Once you're sure that's good, go to the two machines that can't access the internet, and check their IP configuration. Make sure they're setup to get an address automatically (on 95, right click network neighborhood, properties, tcp/ip properties). Once that's setup, you should reboot to let the machine get the IP.
Now, as gigawatz said, there may be a connection issue, Check the hub. Does it have one port on the end that has a button or push-in slot, or it's labeled differently? If so, you need to put the cable that connects the router to the hub in that port, and try pushing the button, and see if you get a link light. then try rebooting the PC's again, once your sure there's a light on that port.
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