After you resume a Windows Vista-based computer from standby, a bus driver is not loaded as expected, and error code 38 is reported


Consider the following scenario:
  • You are running a Windows Vista-based computer.
  • You resume the computer from standby (S3).
In this scenario, a bus driver that manages a Network Driver Interface Specification (NDIS) miniport is not loaded as expected. Therefore, a yellow exclamation mark (!) appears in Device Manager next to the device that is driven by the miniport. The driver also displays error code 38 (CM_PROB_DRIVER_FAILED_PRIOR_UNLOAD).

For example, this problem may occur on a bus driver that manages a USB composite device that includes a network adapter.


This problem occurs because of a timing issue that involves Plug and Play (PnP) detection, the IoWMIRegistrationControl routine, and NDIS initialization.


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.


No prerequisites are required.

Restart requirement

You must restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace any other hotfixes.

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 nameFile versionFile sizeDateTimePlatform
Ndistrace.mofNot Applicable4,54813-Dec-200719:55Not Applicable
Windows Vista with Service Pack 1, 32-bit versions
File nameFile versionFile sizeDateTimePlatform
Ndistrace.mofNot Applicable4,54818-Dec-200721:08Not Applicable
Windows Vista, 64-bit versions
File nameFile versionFile sizeDateTimePlatform
Ndistrace.mofNot Applicable4,54814-Dec-200721:35Not Applicable
Windows Vista with Service Pack 1, 64-bit versions
File nameFile versionFile sizeDateTimePlatform
Ndistrace.mofNot Applicable4,54818-Dec-200721:08Not Applicable


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

More Information

For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:

824684 Description of the standard terminology that is used to describe Microsoft software updates


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