I have upgraded my client's database from FB1.0 to FB1.5, when the
client-server application starts up, this error screen pops up:

"Access violation at address 7C913144 in module 'ntdll.dll'. Write of
address 00404495"

So I re-installed FB1.0, but the same error. The environment of this
site is:

1) the server: Win XP prof. edition
2) 3 client workstations: Win XP home edition
3) we shut down the XP firewall, and disable its anti-virus program at
the server

At the moment, all 3 workstations pops up the same error, but the
application works fine at the Server.

Any suggestions are welcome.

thanks
Duncan