Hello,
It might be time to look at a dedicated server, either a Linux box with Samba, or a true Windows 2000 / 2003 Server. Why? Because workgroup sharing only allows 10 connections at a time, and with 15 at your location, you will run into a problem running out of connections available. You should also be considering the management of the workstations in terms of patches and updates. If you put together a server, consider SUS to do that for you.
Also remember that there are differences between share permissions and NTFS permissions. Make sure you configure them properly.
As you recently took this position over, I would also check the backup scheme, and make sure that things are working properly. Do some sample restores too.
Christian
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