[Samba] samba 3.0.2a dos access problem null password

[Xavier]

Hi all,

I have a samba 3.0.2a installation on a mandrake 9.2 linux box.
Global config is "share level"
In this samba server I need :

1- One read only share for anonymous users (win9x-win2k-...)
2- One read/write share for one authentified user (accessible from a dos 
floppy drive and for win9x - win2k computer


All is fine except that before I reinstall this new samba server, I was 
accessing another winnt4 share with dos floppy drive , using "net use" 
command.
My problem is with passwords encryption I cannot access the samba 3.0.2a 
share throught my floppy disk.
So I putted "null password" autorized into global configuration of 
SAMBA, but now ,even I want to connect with a user with password (into 
win2k for example) the password needs to be "null" ! but the user have a 
passwd ! it is a security problem now.

What best configuration could I put into this server - according to what 
I need to do (see before 1 & 2) ?

Is there a way to give an encrypted password with a dos floppy boot 
drive and "net use" connexion ?

Any help should be appreciated.
Thanks

Xavier