Memory Leak in Keyboard and Mouse Class Drivers When You Unplug and Plug In USB Keyboard or Mouse (278323)

The information in this article applies to:

Microsoft Windows 2000 Server
Microsoft Windows 2000 Advanced Server
Microsoft Windows 2000 Professional

This article was previously published under Q278323

SYMPTOMS

After you unplug and plug in a Universal Serial Bus (USB) keyboard or mouse several times (approximately 42), the system stops sending I/O system event error messages to the event log.

CAUSE

This behavior is caused by a problem in the class drivers. The class drivers are not deallocating allocated system event memory when a device is unplugged.

RESOLUTION

To resolve this problem, obtain the latest service pack for Windows 2000. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

260910 How to Obtain the Latest Windows 2000 Service Pack

The English version of this fix should have the following file attributes or later:

   Date      Time    Version        Size    File name
   -----------------------------------------------------
   5/29/2001 09:28a  5.0.2195.3649  24,400  Kbdclass.sys
   5/29/2001 09:28a  5.0.2195.3649  21,648  Mouclass.sys

STATUS

Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article. This problem was first corrected in Windows 2000 Service Pack 3.

MORE INFORMATION

For additional information about how to obtain a hotfix for Windows 2000 Datacenter Server, click the article number below to view the article in the Microsoft Knowledge Base:

265173 The Datacenter Program and Windows 2000 Datacenter Server Product

For additional information about how to install multiple hotfixes with only one reboot, click the article number below to view the article in the Microsoft Knowledge Base:

296861 Use QChain.exe to Install Multiple Hotfixes with One Reboot

For additional information about how to install Windows 2000 and Windows 2000 hotfixes at the same time, click the article number below to view the article in the Microsoft Knowledge Base:

249149 Installing Microsoft Windows 2000 and Windows 2000 Hotfixes

Modification Type:	Minor	Last Reviewed:	9/26/2005
Keywords:	kbHotfixServer kbQFE kbbug kbfix kbOSWin2000fix kbWin2000PreSP2Fix kbWin2000PreSP3Fix kbWin2000sp3fix KB278323