Hi...is this tip any help to you? You only need part (1) 'Retrieving a lost Network Key' - this is the key/password Windows asks for when you try to connect wirelessly. (Skip part 2..).

You can pick up a manual from the Buffalo site if you need one. I think the router IP address may be http://192.168.11.1 and default password is blank (ie no password), but you would need to check your manual to be sure.

Please come back to Fixya if this does not help.