Microsoft KB Archive/928229

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Third-party network-related programs that use NDIS drivers may no longer function after you upgrade a computer to Windows Vista

Article ID: 928229

Article Last Modified on 10/18/2007


  • Windows Vista Business
  • Windows Vista Enterprise
  • Windows Vista Home Basic
  • Windows Vista Home Premium
  • Windows Vista Ultimate
  • Windows Vista Enterprise 64-bit Edition
  • Windows Vista Home Basic 64-bit Edition
  • Windows Vista Home Premium 64-bit Edition
  • Windows Vista Ultimate 64-bit Edition
  • Windows Vista Starter


Consider the following scenarios:

  • You upgrade a Windows XP-based computer to Windows Vista.
  • You upgrade a prerelease version of Windows Vista to the release version of Windows Vista.
  • You upgrade a release version of one Windows Vista operating system to another release version of Windows Vista.

In any one of these scenarios, third-party network-related programs may no longer function.

You experience this issue with programs such as virtual private network (VPN) programs or load balancing and failover (LBFO) programs.


This problem occurs if the third-party programs use any of the following drivers:

  • Network Driver Interface Specification (NDIS) intermediate (IM) filter driver
  • NDIS IM multiplexer (MUX) driver
  • NDIS protocol driver
  • NDIS Light Weight Filter (LWF) driver

When you upgrade an earlier version of Windows to Windows Vista or you upgrade one version of Windows Vista to another version of Windows Vista, the third-party NDIS drivers that are mentioned in this section are not automatically migrated to Windows Vista. In this situation, the driver file is present on the Windows Vista-based computer. However, the driver is not installed in Windows Vista. Therefore, the functionality that the driver provides is unavailable after you upgrade the computer to Windows Vista.


To resolve this issue and to use the functionality of the third-party network-related program, you must reinstall the third-party program. This will install the third-party NDIS driver.

Keywords: kbinfo kbtshoot kbprb kbdriver kbexpertisebeginner KB928229