[Samba] Could not open share folder from NT or Win9x

[Inquiry]

Hi All,

My Samba box v.2.2.2 is currently running cooperate with NT 4.0 PDC. Some 
sharing folders on Samba box are set as guest access and read-only. Those 
folder can be read rom all version of Windows. However, if I disable 
guest access and specify the user priviledge access for other share folder
("SoftStore" in my smb.conf), I just can access from Windows 2000 & XP. 
Otherwise, I could not access that one from NT or Win9x, even if I typed 
exactly the same user name & password for that. 
So, is there any different among Win2K, XP with NT, Win9x when 
communicating with Samba?

Any help would be very appriciated!

Below is my smb.conf file for your review.

[global]
        smb passwd file = /etc/samba/smbpasswd
        deadtime = 15
        level2 oplocks = True
        write cache size = 262144
        domain master = No
        dns proxy = Yes
        name resolve order = wins lmhosts host bcast
        socket options = TCP_NODELAY IPTOS_LOWDELAY
        oplocks = True
        bind interfaces only = True
        lpq cache time = 45
        preferred master = No
        directory mask = 0755
        debug level = 1
        read raw = no
        security = share
        local master = No
        workgroup = VAT
        server string = VAT CDs server
        getwd cache = yes
        log file = /var/log/samba/log.%m
        netbios name = wombat
        os level = 65
        create mask = 0644
        encrypt passwords = Yes
        password server = *
        public = Yes

[cd1]
        path = /store/cd1
        comment = CD server No1
[cd2]
        path = /store/cd2
        comment = CD server No2

[cd3]
        path = /store/cd3
        comment = CD server No3

[music]
        path = /store/music
        writable = yes
        comment = Music store

[SoftStore]
        path = /store/softarc
        writable = yes
        valid users = it
        delete readonly = yes