[Samba] Question

[Seydel Molina]

I have a unix machine. I am runnung the samba server, but the thing is 
every time that i try to get into the unix server from a windows machne in 
the network a window come out asking me for a user name and pasword.I have 
tried with all user names and assword that i have in my unix machine and i 
get nothing, i am not enable to get into the unix server " Samba server"
Ho can i fix it innorder to set up an standart user to let the windows 
machine get into the unix server.
Sincerely
Seydel Molina