The computer with the internet access is my server.
I get internet through a data stick which runs on the usb.
The other computer that I needs the internet access on connect through a switch to the server..... my LAN.
I need A fixed IP addresses no matter the address for the accounting software.
Server runs on(let me make sure - lol) windows 7 profesional and the other one on windows xp professional.
Is this USB stick a regular network card like for WiFi that connects to a router, or is it a cell modem that used a cell company data plan?
If it's a data plan card, you can set the IP range to be the same for both computers, 192.168.1.2 for one, 192.168.1.3 for the other, and setup Internet Connection Sharing on the server. Just type ICS in the Help of Windows 7, you will get the steps to do that. Then the two computers will talk to each other and the XP system will be able to connect though the 7 system.