Problem connecting - please help!

I am having a really weird problem with my Rangemax wireless router (WPN824) and my Dell laptop running Windows XP.

I set up the Rangemax router to my cable internet connection and security enabled it with a unique SSID. The signal is picked up and works great with my PS3, but for some reason it doesn't work right with my laptop.

The laptop sees the connection and says that it has an excellent connection, but I can't get on to any websites or use any program that requires an internet connection. I am stumped, can someone please help me?

By the way, my laptop has an IntelPro 2200 wireless card.

Thanks in advance!