are they connected to a router or a switch or both?
are they all on the default workgroup/domain (if one or both apply)?
does the administrator account have access to the network on any of the stations?
Do the stations use the harddrive or virtual drives?
1. We have connected to switches interlink with router.
2. All using default workgroup.
3. Administrator was access to network and stations.
4. We used hard drive about 300Gb.