This article was previously published under Q164486
IMPORTANT: This article contains information about editing the registry.Before you edit the registry, make sure you understand how to restore it ifa problem occurs. For information about how to do this, view the "Restoringthe Registry" Help topic in Regedit.exe or the "Restoring a Registry Key"Help topic in Regedt32.exe.
Third party companies can replace the Gina.dll file that ships withWindows NT by editing the following registry key:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon Value = GinaDLL REG_SZ
If the file referenced in the registry is missing or corrupted, Winlogonfails to start, and a blue-screen error message occurs.
NOTE: Windows NT 3.51 loads Msgina.dll if the third-party Gina.dll file isnot found.
Windows NT 4.0 is designed to not load if Gina.dll (or its replacement) isnot present.
To resolve this problem, replace the missing or corrupted Gina.dll with theversion that ships with Windows NT.
WARNING: Using Registry Editor incorrectly can cause serious problems thatmay require you to reinstall your operating system. Microsoft cannotguarantee that problems resulting from the incorrect use of Registry Editorcan be solved. Use Registry Editor at your own risk.
For information about how to edit the registry, view the "Changing Keys AndValues" Help topic in Registry Editor (Regedit.exe) or the "Add and DeleteInformation in the Registry" and "Edit Registry Data" Help topics inRegedt32.exe. Note that you should back up the registry before you edit it.
If Windows NT is installed on a FAT partition, copy the Software file thatis located in the %SystemRoot%\System32\Config directory to a floppy diskand take it to another computer running Windows NT and follow theseinstructions:
Start Registry Editor (Regedt32.exe).
Go to the HKEY_LOCAL_MACHINE window.
Select the HKEY_LOCAL_MACHINE key entry.
From the Registry menu, click Load Hive.
Browse and select the failed Windows NT installation path, for example, Winnt.
Go to the System32\Config directory, and select the Software file.
NOTE: Software file with no extension is the correct one.
Click OK, and type a key name of test.
Double-click the new test key and follow this path:
Microsoft\Windows NT\Current Version\Winlogon
Modify the entry Ginadll:REG_SZ:MSGINA.DLL
From the registry menu, click Unload Hive.
Restart into the original Windows NT installation.
Microsoft recommends that third-party companies use FAT volumes to testtheir versions of Gina.dll. This facilitates the replacement of the newGina.dll file.