Vista - Vista Home Premium drive map to Server 2003

All of my workstations are running WinXP home or pro. All of them have drives
mapped to the server. This new machine has Vista Home Premium and I need to
map the same drive letters to the server.

When I try to map a drive, it asks for a login and password. I did not have
to setup a login or password for any of the XPs and don't want to start it
because there are too many to keep up with.

How can I just map the drive like the XPs there are part of the "Everyone"
group? The server and all of the workstations are in the same workgroup of
"Office".