Open Software Solutions

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 0×00000001. 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.

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

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Hotfix information

A supported hotfix is now 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 service pack that contains this hotfix.

To resolve this problem, submit a request to Microsoft Online Customer Services to obtain the hotfix. To submit an online request to obtain the hotfix, visit the following Microsoft Web site:

Note If additional issues occur or 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. To create a separate service request, visit the following Microsoft Web site:

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

File name	File version	File size	Date	Time	Platform
Update.mum	Not Applicable	1,993	02-May-2007	20:09	Not applicable
X86_dc9916adfe51d55bbaa692d6cf65991a_31bf3856ad364e35_6.0.6000.20590_none_749f95112e9165d0.manifest	Not applicable	694	02-May-2007	20:09	Not applicable
X86_microsoft-windows-win32k_31bf3856ad364e35_6.0.6000.20590_none_b73584c7b6c6d9c4.manifest	Not applicable	6,928	02-May-2007	20:17	Not applicable
Win32k.sys	6.0.6000.20590	2,027,520	02-May-2007	10:29	x86

Windows Vista, 64-bit versions

File name	File version	File size	Date	Time	Platform
Amd64_c708689091d397a70cf7dd41a54048fb_31bf3856ad364e35_6.0.6000.20590_none_ccc06f608e910ab8.manifest	Not applicable	698	02-May-2007	20:10	Not applicable
Amd64_microsoft-windows-win32k_31bf3856ad364e35_6.0.6000.20590_none_1354204b6f244afa.manifest	Not applicable	6,944	02-May-2007	20:21	Not applicable
Update.mum	Not applicable	2,005	02-May-2007	20:10	Not applicable
Win32k.sys	6.0.6000.20590	2,749,952	02-May-2007	10:44	x64

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Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the Applies to section.

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

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