I am trying to help a friend get an older XP (SP3) laptop connected to his wireless network. The SSID shows up fine, the password seems to take fine, but it sits at acquiring network address forever. When I use my laptop or my android phone I connect and get an address with no problems and with normal speed, but his laptop is driving me crazy. I need some suggestions to try. I have deleted the connection and tried again, I have changed the password on the router and tried again, but no luck. I've thought about searching the registry for this particular wireless connection SSID and deleting everything I can find, but don't know if that will help. The next time I go to his house I will also take a USB wireless adapter to install and see if that makes any difference. All security is WPA, but I have tried it with security turned off and with the laptop sitting about 3ft from the router with no success as well.
Suggestions on what to do next appreciated.
edit - The laptop works fine if I bring it to my house and connect to my own wireless network so the basic wireless is working ok.