No connectivity despite excellent signal

I have been having issues connecting to the internet since Monday. Sunday night it worked fine, but since Monday all I get is the yellow triangle with exclamation point in it on my wireless internet icon. I have tried unplugging the wireless adapter, tried re-entering the password, tried to repair, and finally reinstalling the Belkin CD but to no avail.

I have two separate icons in the system tray that show my internet connectivity, one for Belkin and the other for wireless network connection. This is what they currently show when I mouse over them.

Belkin
Connect to network: linksys
Network Type : access point
Encription : TKIP
Transfer rate :54 Mbits/sec

Wireless network connection
Speed: 54 Mbs
Signal Strength: Excellent
Status: Limited or no connectivity

The last two lines above I believe are the issue....excellent signal strength but no connection. There are 4 other computers using the same wireless internet (including the laptop Im currently using) with no issues so it's isolated to this one computer.

Any help would be greatly appreciated!

Thanks,
Dan