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.