How can broadband internet connection is made to both the computers which are in networking?

I have two systems in networking by LAN, one system is Windows 98 and other is Windows XP. Now, I have connected Broadband internet connection with system of windows XP through USB. The system of Windows XP is connected with internet but I am not able to surf internet at system with Windows 98. Kindly instruct as to how the internet connection can be achieved at both the systems. I am layman in this field. Kindly let me have complete manual in this regard.