I understand a bit more of what you are seeking now.
Click Start, Run, and enter this: control userpasswords2
There is a checkbox there that you can check to force users to enter a password to log on.
This not guaranteed to work.
This is guaranteed to work...
Start>Settings>Control Panel>Network Connections,
Right-click your Network Card, select Properties, (The General tab should be showing, if not, click it),
Click "Client Service for NetWare"
Re-start Windows. You will now need to click your username to log on.