Wife got me a new MBP so I'm still trying to figure it out. I'm trying to share a folder with my windows desktop. Folder sharing is enabled in windows. I 'connect to server' on the MBP using my desktop's IP. I get a box that says 'guest' and 'registered' user. I select registered and it's asking for a username and password for the PC. Is this the router login? I used that and it doesn't take it. I don't have a password on windows. I've tried every possible login I have and nothing works. What is it wanting right here?