Limited or No Connectivity? [Wireless Problem]

I'm getting a limited or no connectivity error when i'm trying to get a laptop to work with my wireless router (NetGear). i updated the wireless card drivers, and i added the MAC address to the access list. I've use the router before with other computers and it has worked flawlessly. but this laptop is being a P.I.T.A. Could the wireless card just be no good anymore? i have the wireless set as an open system just so I can get it working, but no luck. Laptop is Windows XP.

Any Ideas??

It's a Windows XP Service Pack 2 bug afaik... this patch should fix it: http://www.microsoft.com/downloads/d...DisplayLang=en

Great, Thanks a lot!