The Default Windows Logon Interface May Not Appear After Installing Third-Party Program

When you start your computer after you install a third-party program, the default Windows logon interface may not appear. In Windows XP, the Welcome Screen and the Fast User Switching feature may no longer be available.

This issue can occur if the Graphical Identification and Authentication file (Msgina.dll) is replaced by a third-party program.

Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:
To restore the default Windows logon interface, remove the following string value from the registry: After you do so, Windows uses the default Graphical Identification and Authentication file (Msgina.dll).