[Samba] 'access denied' for Windows 7 client

[Bart Vandewoestyne]

Hello list,

I am trying to let my girlfriend's Windows 7 Home Premium laptop access 
my samba shares and printer, but unfortunately all she gets are 'Access 
Denied' errors when trying to access the samba server.

My full setup and the things I tried already are described in the txt 
file at https://www.dropbox.com/s/l83hat2b0yw6cre/samba_problem.txt

What else can I check or try to diagnose the exact problem or even solve it?

Thanks,
Bart