The computer's name need to be unique within a given network. If another computer is already connected, and have the same name, you have a conflict and the second request is denied.
Make sure that all connected computers have different names.
Make sure that you effectively send 8 bits per byte for your password (extended ASCII). Maybe your laptop only send 7 bits bytes (base ASCII character set).
If you send 7 bits bytes, you effectively only send 35 or 91 bits.
If all else fails, can you connect that laptop using an ethernet cable? Try that and use that connection to set the password for that computer.
I recomend that all your computers use different password. It's safer that way.
Electro
September 2011