Microsoft KB Archive/928570

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Article ID: 928570

Article Last Modified on 9/11/2007


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


You start Windows Vista from a Microsoft Windows Preinstallation Environment (Windows PE) 2.0 image by using the flat file boot method. When you do this, an access violation occurs.


This problem occurs because an error occurs when the CD file system (CDFS) driver interacts with a file-based write filter driver.


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:


To apply this hotfix, you must have Windows Automated Installation Kit (Windows AIK) or Microsoft Windows OEM Preinstallation Kit (OPK) installed.

Restart requirement

You do not have to restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace a previously released hotfix.

Registry information

To use one of the hotfixes in this package, you do not have to make any changes to the registry.

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 version
File name File version File size Date Time Platform
Fbwf.sys 6.0.6000.20484 69,120 16-Nov-2006 04:39 x86
Fbwflib.dll 6.0.6000.20484 12,288 16-Nov-2006 07:57 x86
Windows Vista, 64-bit version
File name File version File size Date Time Platform
Fbwf.sys 6.0.6000.20484 97,280 16-Nov-2006 05:11 x64
Fbwflib.dll 6.0.6000.20484 15,360 16-Nov-2006 08:14 x64

Resolution information

To resolve the problem after you apply the hotfix, follow these steps.

  1. Create a flat boot ISO image of Windows PE. To do this, follow these steps.

    Note The following steps assume that the Windows6.0-KB928570-x86.msu file or the Windows6.0-KB928570-x64.msu file is in the C drive. If the Windows6.0-KB928570-x86.msu file or the Windows6.0-KB928570-x64.msu file is in another location, replace "C:\" with the path of the Windows6.0-KB928570-x86.msu file or of the Windows6.0-KB928570-x64.msu file.
    1. At a command prompt, run the following command to expand the .msu file on a 32-bit computer:

      expand C:\Windows6.0-KB928570-x86.msu C:\

      Note On a 64-bit computer, run the following command:

      expand C:\Windows6.0-KB928570-x64.msu C:\

    2. Click Start[GRAPHIC: Start Button], point to All Programs, point to Microsoft Windows AIK, and then click Windows PE Tools Command Prompt.
    3. Run the following commands at the Windows PE Tools command prompt:

      copype x86 C:\flatPE
      imagex /mountrw C:\flatPE\winpe.wim 1 C:\flatPE\mount
      peimg /import=C:\ C:\flatPE\mount\Windows
      peimg /install=*928570* C:\flatPE\mount\Windows
      peimg /prep mount
      imagex /unmount /commit C:\flatPE\mount
      imagex /apply C:\flatPE\winpe.wim 1 C:\flatPE\mount
      copy C:\flatpe\ISO\bootmgr C:\flatPE\mount
      mkdir C:\flatpe\mount\boot
      Bcdedit -createstore C:\flatpe\mount\boot\BCD
      Bcdedit -store C:\flatpe\mount\boot\BCD -create {bootmgr} /d "Boot Manager" Bcdedit -store C:\flatpe\mount\boot\BCD -set {bootmgr} device boot Bcdedit -store C:\flatpe\mount\boot\BCD -create /d "WINPE" -application osloader

      Note After you run the last command, you receive a GUID value. Note this value.
    4. Run the following commands at the Windows PE Tools command prompt.

      Note In these commands, replace GUID with the GUID value that you noted in step 1c.

      Bcdedit -store C:\flatpe\mount\boot\BCD -set GUID osdevice boot
      Bcdedit -store C:\flatpe\mount\boot\BCD -set {bootmgr} default GUID
      Bcdedit -store C:\flatpe\mount\boot\BCD -set GUID device boot
      Bcdedit -store C:\flatpe\mount\boot\BCD -set GUID path \windows\system32\boot\winload.exe
      Bcdedit -store C:\flatpe\mount\boot\BCD -set GUID systemroot \windows
      Bcdedit -store C:\flatpe\mount\boot\BCD -set GUID winpe yes
      Bcdedit -store C:\flatpe\mount\boot\BCD -set GUID detecthal yes
      oscdimg -n mount flatPE.iso

  2. Burn the ISO image of Windows PE to a blank CD by using a CD-burning program.
  3. Use this ISO image of Windows PE to start Windows Vista.


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


When you use the flat file boot method, Windows PE files are not stored in a boot image. Instead, Windows PE files are stored in a flat file directory structure. Windows PE is started directly from the flat file directory structure.

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

Additional query words: create flat boot WinPE 2.0 ISO

Keywords: kbfix kbqfe kbpubtypekc kbexpertiseadvanced kbhotfixserver KB928570