Read up on XP....
http://www.microsoft.com/windowsxp/...pro/default.asp
Do you have a LAN setup?
If you have a NIC and its connected to a LAN, pull the CAT5 cable out of your NIC restart computer, log into XP.
ps. If the only NIC your have installed runs to your cable modem then disregard this.
By doing the above you've esstially, mandated your IPs to only your dial-up/cable modem IP address & 127.0.0.1 (ie. localhost)