Consider the following scenario:

• You are using a Windows Vista-based computer.
• The color scheme is set to Windows Aero.
• You enter your credentials to unlock the computer. When you unlock the computer, you switch from a secure desktop to the default desktop.
• An event hook is running in the secure desktop. The event hook is registered by using the SetWinEventHook application programming interface (API).

Note: A secure desktop is displayed when the computer is locked. From a secure desktop, you can enter your credentials to unlock the computer.

In this scenario, you receive a Stop error message that resembles the following:

Stop 0×00000001 (0×00000000, 0×7ffdc000, 0×0000ffff, 0×00000000)