System32 Folder Opens When Logging on to Windows XP, Windows 2000, or Windows NT 4.0

When you log on to Microsoft Windows, a Microsoft Windows Explorer window may open that displays the contents of the System32 folder.

This behavior also occurs if there is a String value that contains only a single quote character (") as the Value data in the following Registry key:

This behavior can occur if a null, incomplete, or damaged entry exists in the registry.

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:
Use Registry Editor to view the following two Windows registry keys: Verify that all the values in these keys do not contain any incorrect, incomplete, or null entries (such as "").

An incorrect entry in the following registry value has been confirmed to cause the behavior described above: If the value data for this entry is null or appears in Registry Editor as quotation marks, you may experience the problem described above. To correct the problem, change the value data to match the entry above or delete the ActiveMovie File Extensions value.

You can resolve this behavior by deleting the Remainder value that has "" next to it is in the following registry key:
If you are uncertain whether an entry is incorrect or incomplete, you may want to delete all entries other than the default Windows entry. The following entry to run the System Tray is the only required Windows default entry: For additional information, click the following article number to view the article in the Microsoft Knowledge Base: