Just upgraded to OS2006 and cannot connect to my wireless router (Liksys WRT54G).

I have gone back and entered the 770's MAC address in the router's filter list and I am sure it's correct. I have also deleted the connection in the 770 (4 times) and very carefully entered the WPA pre-shared key each time I start over. What's next??? I keep getting the network connection error.

Any help is greatly appreciated.