Removing the encryption for a test might be useful to isolate the issue. If you're using WEP, you MUST use the hex key option, not the passcode option. Different brands of equipment convert WEP passcodes into non-matching keys. 
It's easy to reconfigure ALL the encryption on the wireless, just to make sure it's not a key mismatch issue.
It's easy to reconfigure ALL the encryption on the wireless, just to make sure it's not a key mismatch issue.