How to replace in-use files at Windows restart

If you need to replace a file that is in use by Microsoft Windows, you typically must use one of the following methods:

• Start the computer with an MS-DOS boot disk to replace the file if your computer uses the File Allocation Table (FAT) file system on the boot partition.
• Perform a parallel installation of Windows if the boot partition uses the Windows NT file system (NTFS).
• Use the Mv.exe method that is specified in the following article in the Microsoft Knowledge Base:
  
  184408 How to replace in-use Windows NT system files
• Rename the file at a Windows command prompt. To do so, type the following lines at a command prompt, pressing ENTER after each line:
  ren <drive>:\<path>\<file>.sys <drive>:\<path>\<file>.old
  copy <drive>:\<temp folder>\<file>.sys <drive>:\<path>\<file>.sys
  After you type these lines, restart the computer. Many files cannot be renamed using the Windows Explorer shell, but can be renamed using a command prompt.

This article describes another method you can use to replace files that are in use by Windows. This method uses the registry to replace a file at startup, before the file is accessed by Windows.

Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:
The following steps demonstrate how to replace the Win32k.sys file in the %SystemRoot%\System32 folder with the Win32k.sys file located in the C:\Temp folder. You can use variations of this method to replace any file if your installation of Windows is bootable.

1. Start Registry Editor (Regedt32.exe).
2. Locate the following key in the Windows registry:
   HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager
3. Create a new value by using the following information:
   Value name: PendingFileRenameOperations Data type : REG_MULTI_SZ Value data: \??\c:\temp\win32k.sys !\??\c:\winnt\system32\win32k.s
   Note that the value data is typed on two separate lines.
4. Quit Registry Editor.
5. Restart the computer.

For additional information, click the following article number to view the article in the Microsoft Knowledge Base: