Got a 5 year old linksys router. Last night, wifes dell latitudes internet wouldn't pull up. Unplugged and restart and did all those things, nothing. The laptop is windows XP. The router would not send the IP address to the laptop. Wifi worked, full signal....the dell was reading the signal and hardware diagnostic showed no problems with any internal stuff inside the Dell. Now, my daughters Compaq has windows 7, router works fine. Both our smartphones pick up the wifi and they work fine. It's strictly the Dell. The ipad works fine. What's the deal??? We have not downloaded Service Pack 3 for XP. Is that the problem?