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Home > Success Center > Network Performance Monitor (NPM) > Missing MSVCR120_CLR0400.dll file

Missing MSVCR120_CLR0400.dll file

Created by Juan Carlo del Rosario, last modified by MindTouch on Jun 23, 2016

Views: 9 Votes: 0 Revisions: 11


Unable to access the NPM Web Console after installing Windows patches.

The following error message appears when trying to access the NPM Web Console upon installing Windows patches:

Service Unavailable - HTTTP Error 503

In an attempt to fix the issue by running Configuration Wizard, the following error appears:



NPM v11.5


The MSVCR120_CLR0400.dll file is missing.


  1. Download and unzip the attached file.
    Note: It is recommended to unzip the file in the directory of the program that needs the file.
  2. Extract the .dll file to a location in your computer.

If the above steps do not work, 

  1. Extract the file to your system directory - C:\Windows\syswow64 (Windows 64-bit).
  2. Create a backup of any existing .dll file in the directory.
  3. Overwrite the files with the extracted .dll files.
  4. Reboot your computer.

If the issue still exists,

  1. Go to Start > Run.
  2. Type CMD > press Enter (for Windows ME, type COMMAND)
  3. Type regsvr32 <filename>.dll and press Enter.



Last modified
22:41, 22 Jun 2016