I had removed the Novell Netware client from an XP workstation and received this error message after a reboot. It’s simply a registry key that hasn’t been deleted during the Novell client uninstall process.
Restart the PC in Safe Boot mode. Open the registry and locate the following key:
The value is set to NWGINA.DLL
Double click the GinaDLL key and change the value to MSGINA.DLL
Restart the PC and you should now have a Windows login prompt.