MMC cannot open file C:\Windows\System32\DFRG.MSC

I HAVE BEEN TRYING TO DEFRAG MY COMPUTER, IT WILL NOT WORK.
IT SAYS IT MAY BE, BECASUSE THE FILE DOES NOT EXIST, IS NOT AN MMC CONSOLE OR WAS CREATED BY A LATER VIRSION OF MMC.

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Answer
I had the same problem.  There was a simple fix for me in C:\Documents & Settings\'my PC name'\Application Data\Microsoft\MMC folder".  The dfrg file was the only file showing. However, the extension '.msc' was missing.  When I added the extension, this fixed my problem.

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Hi Linda Woods,
Welcome to Microsoft Answers!
MMC cannot open the file C:\WINDOWS\system32\dfrg.msc
This may be because the file does not exist, is not an MMC console, or was created by a later version of MMC. This may also be because you do not have sufficient access rights to the file.

To resolve this issue, follow these steps:
1. Click Start, click Run, type cmd, and then click OK.
2. At the command prompt, type cd %windir%\system32, and then press ENTER.

Note The %Windir% folder is the folder where you installed Microsoft Windows.
3. Type the following commands. Press ENTER after each command.
regsvr32 msxml3.dll
regsvr32 dfrgsnap.dll
regsvr32 dfrgui.dll
4. Type exit, and then press ENTER to close the Command Prompt window.
5.  Restart the computer.

Method 2: Go to C:\Windows\Inf, right click at dfrg.inf file and select Install.
 
Method 3:
If the above methods does not help, run the system file checker tool.
You may do a System File Checker (SFC) scan on your computer. SFC tool scans system files and replaces incorrect versions of the system files by using the correct versions.
 
To run the System File Checker tool, follow these steps:
 
1.    Click Start, and then type cmd in the Start Search box.
2.    Right-click cmd in the Programs list, and then click Run as administrator. If you are prompted for an administrator password or confirmation, type your password or click Continue.
3.    At the command prompt, the following line, and then press ENTER:
sfc /scannow
 
Check the below link for details:
How to repair the operating system and how to restore the operating system configuration to an earlier point in time in Windows Vista
http://support.microsoft.com/kb/936212/
 
Regards,
Divya R – Microsoft Support.
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Last updated June 29, 2020 Views 20,545 Applies to: