assuming your router is 192.168.0.1
http://web.belkin.com/support/kb/kb.asp?a=2824
Windows XP
1. Click on the Start menu, select Control Panel
Note: If you are running Windows XP in classic mode, you will need to select the Start menu, select Settings, then choose Control Panel
2. Click the Switch to Classic View icon
3. Double-click the Network Connections icon
4. Double-click on the Local Area Connection of the adapter you want to manually assign, select properties
5. Double-click on Internet Protocol TCP/IP, Select use the following IP address, and then type a unique IP address for each client computer using the range between 192.168.0.2 to 192.168.0.254
6. In the Subnet Mask section, type 255.255.255.0
7. In the Gateway section, type 192.168.0.1
8. Select Use the following DNS Server Addresses, type 192.168.0.1 under preferred DNS server and click OK