On my laptop, which is wirelessly connected to my home network, I cannot access my Network Attached Drive (NAS) which is a Buffalo Linkstation. The computer can see it and it works as a media player OK. However when I try to look at stored files I get asked for a login username and password, neither of which can I remember setting up. I can access it OK from my Desktop computer but not from the laptop. I cannot understand how a password got set. I just need to remove it. How do I do it?