I recently got a wireless adapter for cheap on ebay, the Netgear WG111v2, to be used with my laptop running Windows XP sp2. After installing the software for the WG111v2 and reboot I notice that the welcome screen was replaced with the logon screen. Basically you must type username and password instead of selecting users by a distinctive icon.
What happens here is that the NetGear software for WG111v2 replaced the system logon MSGINA.DLL with RTLGina2.dll, therefore using a 3rd party GINA will disable the Welcome Screen and the Fast User switching as well.
The first thing that came to my mind was to remove the incriminated DLL and everything would set back to normal, well, not really. DO NOT DELETE RTLGina2.dll or you will not be able to login into the OS as usual, you will receive an error that RTLGina2.dll is missing, you will be able to log in into XP only in safe mode and that’s not good. Instead you have two options:
1. Via registry editing. Before editing the registry make a back up of it, if you are unsure on what to do go to option # 2. Go to Start, Run and type regedit. Look for HKEY_Local_machine/software/microsoft/windowsNT/current version/winlogon and delete the keyGINAdll. At the next reboot everything should be ok.
2. Use this small program and fix the problem with a safe click and without messing with the registry.