wipe out the existing LAN connection and start again , the network setup wizard will configure ICS automatically it should only take five minutes. beware that it also turns on the xp firewall automatically so you will need to turn this off if you use another firewall.
On the machine that doesnt have the internet, go into the IP settings in the LAN and change to auto obtain IP address. Now reboot. On the machine with the internet, go into the IP settings of the LAN, change to be the same option and reboot. Now bring up the dial up box and change from 'me only' to 'everyone' and you will have to enter the password. Let it connect, now hang up the connection. Now go into properties for the internet connection and share it. This should work. If it doesnt, please come back.
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