Hi Marv,
The Gateway line should be the address of whatever box is providing internet access from your network. If you get ICS working then it will be the address of your XP box.
However the inability to ping from your XP box indicates a problem with its network setup. Check over the settings in Control Panel -> Network Connections -> Local Area Connection -> Properties -> Hilight "Internet Protocol (TCP/IP)" -> Properties. I'd recommend the following settings:
Address: 192.168.0.1
Netmask: 255.255.255.0
Gateway: 192.168.0.1
Cheers, Dave.
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