wireless quit on home system but works at office

we have at home a desktop computer with a sprint wireless card that is connected to port 1 of the belkin router and has ICS enabled. been working great for months. last saturday, i browsed the internet fine on my HP laptop wirelessly. got up sunday and it would not connect. no downloads or updates. hubby's laptop connected fine wirelessly until sunday night, then his quit connecting. desktop still connects fine to the internet. checked the router and it is assigning DCHP addresses to the laptops and they both are showing connected to the network with excellent strength, but will not goto web pages. but both laptops connect fine to the wireless network at our office.