Anyway, since new to setup samba, I thought it just matter click Next, Next, ... and so on. Not that easy maa. After setup it in kubuntu, whenever I submit uname/passwd from windows xp, it keep popup the uname/passwd, without error msg. Spend hours RTFM, google , read article, ... then, manage to fix it. When troubleshoot, I reach to the:
C:\> net view \\bigboy
System error 5 has occurred.
Access is denied.
Then, it easier to fix when know cause of the problem. Just enable the 'encrypt password = yes'. I also added the samba user by smbpasswd