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I don't know if this is your problem or not, but unless your cable provider specifically says that you are allowed multiple internet IP addresses, you will need to install a router.
If both computers are connected to a plain hub, which in turn is connected to the cable modem, then the two computers will try to get IP internet IP addresses from your cable provider's DHCP server. If your account only includes one IP (as most cable accounts do), then there will be problems.
When you use a router, it's different. The router is assigned the internet IP address, and the computers "behind" the router are each then given a local IP address, i.e. 192.168.1.100 and 192.168.1.101.
I'd recommend getting a router. You get increased security and you can connect however many computers you want to your connection.
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