Open Software Solutions

You may experience the following problems in Windows Vista when you use a high performance mouse, and you enable the Enhanced Pointer Precision option:

•	The pointer does not move correctly when you move the mouse down and to the right side.
•	The pointer moves by itself.
•	The pointer movement is irregular.

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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:

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, x86-based versions

File name	File version	File size	Date	Time	Platform
Update.mum	Not Applicable	1,993	19-Apr-2007	20:48	Not Applicable
Win32k.sys	6.0.6000.20581	2,027,520	19-Apr-2007	01:09	x86
X86_e566840f96e57cfab674c8f30780d67a_31bf3856ad364e35_6.0.6000.20581_none_8cb5fb107fb994e7.manifest	Not Applicable	694	19-Apr-2007	20:48	Not Applicable
X86_microsoft-windows-win32k_31bf3856ad364e35_6.0.6000.20581_none_b74154fdb6bdd72a.manifest	Not Applicable	6,928	19-Apr-2007	20:54	Not Applicable

Windows Vista, 64-bit versions

File name	File version	File size	Date	Time	Platform
Amd64_997b0c5b5cdc62ab471efcbb02825611_31bf3856ad364e35_6.0.6000.20581_none_d7b6761ef57678eb.manifest	Not Applicable	698	19-Apr-2007	20:48	Not Applicable
Amd64_microsoft-windows-win32k_31bf3856ad364e35_6.0.6000.20581_none_135ff0816f1b4860.manifest	Not Applicable	6,944	19-Apr-2007	20:59	Not Applicable
Update.mum	Not Applicable	1,993	19-Apr-2007	20:48	Not Applicable
Win32k.sys	6.0.6000.20581	2,749,952	19-Apr-2007	01:28	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, click the following article number to view the article in the Microsoft Knowledge Base:

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