This registry value is often set to 0x0000 when the Microsoft TweakUI Power Toy utility is used to disable Microsoft Internet Explorer.
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:
322756 How to back up and restore the registry in Windows
To resolve this issue, delete the following registry value, log off, and then log on to the computer:
Microsoft Windows 2000 Server, Microsoft Windows 2000 Professional Edition, Microsoft Windows NT Server 4.0 Standard Edition, Microsoft Windows 98 Standard Edition, Microsoft Windows NT Workstation 4.0 Developer Edition