You receive a Stop error message on a Windows Vista-based computer: "Stop 0x00000001 (0x00000000, 0x7FFDC000, 0X0000FFFF, 0X00000000)"

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 appears when the computer is locked. When a secure desktop appears, you can enter your credentials to unlock the computer.

In this scenario, you receive a Stop error message that resembles the following:Note The Stop error message always has a Stop error code of 0x00000001. Also, the third parameter of the Stop error message is always 0x0000FFFF.

This problem may also occur after you repeatedly put the computer to sleep.

This problem occurs because of an error in the Win32k.sys file.

Service pack information

To resolve this problem, obtain the latest service pack for Windows Vista. For more information, click the following article number to view the article in the Microsoft Knowledge Base:

Hotfix information

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.

If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site: Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.

Prerequisites

There are no prerequisites for installing this hotfix.

Restart requirement

You must restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace a previously released hotfix.

File information

The English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time item in Control Panel.

Windows Vista, 32-bit versions

Windows Vista, 64-bit versions

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section. This problem was first corrected in Windows Vista Service Pack 1.

For more information about the SetWinEventHook function, visit the following Microsoft Developer Network (MSDN) Web site: