Gateway

[HrBingR]

Hi. Let me explain my current problem. i am struggling to get a gateway to allow internet access. I have 3 Pc's I want to gateway at the moment. 2 Are running Windows 7 (RC1 Build 7100) And the other is running Win XP (Pro SP2). One of my Win 7 Pc's has 2 LAN Cards in. One onboard and 1 PCI. The problem only started recently for some reason, because for a few hours I can use the net, but then the Gateway pc (The one with 2 LAN cards) stops sending out IP addresses to the other two pc's. My modem is connected to my pc with the 2 LAN cards and I can still use internet on this machine. But I don't know why the connection drops on the other two pc's. I know it's the gateway pc causing the problem, because once I restart it, everything's fine for an hour or two... Please help.