The drivers are the PNP-X drivers from the Support Page.  They aren't necessary for the 323 to work properly.  Have you tried to set up a user for yourself on the 323?  
I had some early trouble with Vista (and to a greater extent with Windows Seven) and the 323 with mapping drives.   What I did was create an administrators group and a user & password for myself and adding myself to the administrators group.  Then I went to Network Access and modified the share and replaced the ALL group with the administrators group.  Going back to Computer, I was able to map a drive with the username and password I created on the 323.  This solution worked on Vista, Seven, and XP for me.
The problem I had was with Vista and Seven not accepting a blank user & password.  Windows was requiring a username and a password - nothing worked if either was blank.  XP never had that issue for me, guest/anonymous access worked perfectly.