logon script MapNetworkDrive

Hi

Have DLink NAS (Linux FS through Samba) and am mapping password
protected folders using a login script. I have got 25 XP computers
mapping correctly - some users mapping 7 folders using 7 different
username and passwords (to the NAS).

Joining a Vista Ultimate is another matter

Error: Multiple connections to the server or shared resource by the
same user, using more than one user name are not allowed
Code: 800704C3
Source: WshNetwork.MapNetworkDrive

I have disconnected all mapped drives on this machine but it still
does not work - same error.

Further info: this same account (username/password) works fine in XP
machines.