WMI WDM Provider Rejects Instance Data From Driver

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Article ID: 266254 - View products that this article applies to.
This article was previously published under Q266254
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The Windows Driver Model (WDM) provider does not return instance data from a WDM driver. This problem is indicated by the following entry in the WMI provider log file (Wmiprov.log):
date and time : WDM Buffer size and actual size of data do not match.


WDM-based device drivers (such as SCSI) use WMI to retrieve performance information, control device features, and signal events. The WDM driver provides WMI data by using its classes, and this is also known as the driver's schema. These classes are defined in a binary .mof file that is embedded in the driver. If the driver's schema contains sub-classes, a bug in WMI's WDM provider causes an invalid size calculation of the driver's classes. This ultimately prevents the driver from communicating with WMI.


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    Platform
   9/28/2000  19:45:12  1.50.1085.31  110,660  Wmiprov.dll  x86

Using the Hotfix Installer

NOTE: You can use this method only for Intel-based computers with Windows 2000 installed.
  1. Copy the hotfix executable file (Q266254.exe) to a local folder on your computer or to a share on your network.
  2. Run the Q266254.exe file and follow the directions.
  3. Restart your computer.


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 2.


Article ID: 266254 - Last Review: October 25, 2006 - Revision: 4.1
  • Microsoft Windows Management Instrumentation 1.5, when used with:
    • Microsoft Windows 2000 Standard Edition
kbqfe kbhotfixserver kbbug kbenv kbfix KB266254

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