Win 98 clients connecting to W2k3

I'm having a problem with users after logging onto the 2k3
server having access to resources.
The server has two drives. One formatted NTFS, and the
other is formatted FAT32 for Word Perfect file access.
Once the user is logged in, they can access the FAT32
drive with no problem.
Accessing resources on the NTFS drive delivers an access
denied error.
If the user double clicks a mapped drive short cut to the
NTFS drive and then closes the window they can now access
resources. ???????????????
Any ideas???