Question : Can not resolve an IP adress, winXP home

I trying to help a client.
They Dell Inspirion 1300 laptop running Windows Xp Home.  someone else had set up their little network (DSL modem, Rockwell Wireless, and two laptops).  A while back (more then a year ago), one of the laptops fall off the network and has not been able to connect to the internet again.

I've tried to troubleshoot, connected the laptop directly to the modem, repaired the network connection (RJ45), disabled and then reenabled, still no luck.  I have the same (or similar) issue with the wireless connection, similar troubleshooting.  I've also tried to release and renew the ip from a cmd prompt.

I have not ran any spyware removal software as of yet.  The computer did not seem to have any random issues (popups, etc), so that did not come to mind while troubleshooting.

Suggestions on what to attempt next?

I am trying to be on site tomorrow or the next day.

Answer : Can not resolve an IP adress, winXP home

try winsockxpfix.exe?
http://majorgeeks.com/WinSock_XP_Fix_d4372.html

In the past removal of programs like limewire and such, would cause damage to the winsock files, and this would resolve it.
Great program.  Has a good reputation for fixing similar problems as what you describe.  

You may also try using hijackthis and post a log here, in case you are infected.  Then we can work on it from there.