Signal Strength Good, But No Internet Connectivity?

I can't figure this one out, i had to replace my cable modem, my laptop A on wi-fi home network works fine on internet, however my other laptop B, has a belkin card that shows great signal strength but limited or no connectivlty to the internet (can't get on at all) The laptop A has an internal wifi card that uses windowsxp to connect to net, the laptop B has a belkin card that uses belkin software to configure the connection. i've tried retyping in the WEP, no luck. The cable guys said something about getting a new MAC address with the new modem, but laptop A connects fine, they're both set to autodetect settings. Help???

 

What Hardware the Wireless is suppose to connect to?

You have a Cable/DSL Router or what?

Link to: Wireless - Basic Configuration.

Link to: Wireless Security.