kurma

I have a small LAN with a PC win2000 sp4, a N&C lan hard drive and a Oki printer, everything is OK.

The problem is when I connect a laptop with vista home premium: I can not use the lan hard drive.
I can access it, and see the root directory, but when I try to enter some dir, or open a file it stands forever......
I have tried connecting another cpu, with vista ultimate, same problem.

I can ping the driver from vista, I've tried with static and dynamic IPs, all PCs are in the same workgroup.....

I haven't found any firmware update for the drive.

I suppose it is not a firewall issue, as I have full access to internet.
Wonder how could I resolve it.... I suppose is some security issue in Vista??