Follow this guide for setting up IPinator SmartDNS on Windows XP.
Click on the “Start” button, then click “Control Panel”.
Click on “Network and Internet Connections”. Click on “Network Connections”.
Right-click the interface through which you are connected to the Internet and click “Properties”.
Click on “Internet Protocol (TCP/IP)” and then click the “Properties” button.
Click on the “Use the following DNS server addresses” radio button. Enter your DNS Proxy IP address and click on the “OK” button.