Error 25003. Error occurred while initializing fusion

The Microsoft .Net Framework 4.0 Setup may fail without any error message or the setup may crash during the install phase. You can find the below error message in the Setup log file (Microsoft .NET Framework 4 Setup_******_******-MSI_netfx_Core_*.msi.txt) under user temp folder(%temp%):

MSI (s) (18:60) [15:39:53:968]: Executing op: CustomActionSchedule(Action=CA_InstallAssemblyDef.3643236F_FC70_11D3_A536_0090278A1BB8,ActionType=1025,Source=BinaryData,Target=InstallAssembly,CustomActionData=C:\WINDOWS\Microsoft.NET\Framework\v4.0.30319\;C:\WINDOWS\Microsoft.NET\Framework\v4.0.30319\ISymWrapper.dll;78168)   
MSI (s) (18:00) [15:39:54:031]: Invoking remote custom action. DLL: C:\WINDOWS\Installer\MSI43B.tmp, Entrypoint: InstallAssembly    
09/16/13 15:39:54 DDSet_Status: LANGID: 1033    
09/16/13 15:39:54 DDSet_Entry: InstallAssembly started    
09/16/13 15:39:54 DDSet_Status: CustomActionData: C:\WINDOWS\Microsoft.NET\Framework\v4.0.30319\;C:\WINDOWS\Microsoft.NET\Framework\v4.0.30319\ISymWrapper.dll;78168    
09/16/13 15:39:54 DDSet_Status: No ProductCode was passed in the CustomActionData. Using the current ProductCode.    
09/16/13 15:39:54 DDSet_Status: ProductCode for assembly install/uninstall has been set to {F5B09CFD-F0B2-36AF-8DF4-1DF6B63FC7B4}    
09/16/13 15:39:54 DDSet_Status: Loading C:\WINDOWS\Microsoft.NET\Framework\v4.0.30319\fusion.dll    
09/16/13 15:39:54 DDSet_Error: Failure creating interface IAssemblyCache
09/16/13 15:39:54 DDSet_Error: CreateAssemblyCache() returned -2147024703
09/16/13 15:39:54 DDSet_Error: Error occurred while initializing fusion.    
MSI (s) (18:5C) [15:39:54:109]: Product: Microsoft .NET Framework 4 Client Profile -- Error 25003. Error occurred while initializing fusion.

The above error indicates that the Custom Action (CA_InstallAssemblyDef.3643236F_FC70_11D3_A536_0090278A1BB8) failed to install an assembly in the Global Assembly Cache. After debugging the issue, I found that dummy CRT file msvcr100_clr0400.dll was present on the system. The Microsoft .NET Framework 4.5 carries dummy versions of these CRT files (the files contain no executable code) for various compat reasons.

As per the installer log, the dummy CRT files were already present before the installation took place:

MSI (s) (18:60) [15:38:31:703]: File: C:\WINDOWS\system32\msvcr100_clr0400.dll;           Won't Overwrite;                Won't patch;      Existing file is of an equal version   
MSI (s) (18:60) [15:38:31:703]: File: C:\WINDOWS\SysWOW64\msvcr100_clr0400.dll;       Won't Overwrite;                Won't patch;      Existing file is of an equal version

I was able to resolve the issue by renaming the file msvcr100_clr0400.dll at the below two locations:

C:\Windows\System32\msvcr100_clr0400.dll
C:\Windows\SysWOW64\msvcr100_clr0400.dll

Comments

• Anonymous
  November 20, 2013
  Thank you, Renaming solved my problem.

• Anonymous
  November 23, 2013
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• Anonymous
  November 24, 2013
  Thanks a lot. It realy works. Finally this problem solved. Thank you, Soumitra Mondal!

• Anonymous
  December 29, 2013
  You are amazing...... 6 Hours of working on this and all better.. Thank you.

• Anonymous
  January 08, 2014
  AWESOME!  After fighting with this for over a day.  This resolved the issue. Many MANY thanks!

• Anonymous
  January 23, 2014
  Your'e a legend! { } Thanks

• Anonymous
  March 20, 2014
  Thanks!!!!!! You just solved me soooo much time!!! this should be posted in microsoft support!

• Anonymous
  March 23, 2014
  Thanks! It worked!

• Anonymous
  April 13, 2014
  Thanks, I was out of my wits to reinstall the .Net 4 after uninstalling .Net 4.5, It kept failing to install. You have saved me a great deal of time. Many thanks Soumitra Mondal.

• Anonymous
  May 14, 2014
  Awesome!!! That did the trick...

• Anonymous
  May 19, 2014
  Thanks...It worked...!!!

• Anonymous
  June 03, 2014
  Thanks..appreciate your help.

• Anonymous
  June 08, 2014
  Brilliant thanks

• Anonymous
  August 13, 2014
  GREAT ! ! Worked perfectly !

• Anonymous
  November 26, 2014
  Yes!!  Hours trying to figure this out. Brilliant and a big big thanks!

• Anonymous
  January 26, 2015
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• Anonymous
  February 08, 2015
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• Anonymous
  March 10, 2015
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• Anonymous
  March 25, 2015
  Perfect, this worked for me after a lot of time spent.  Thanks again

• Anonymous
  April 24, 2015
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• Anonymous
  April 27, 2015
  Your'e a legend! Thanks

• Anonymous
  April 27, 2015
  Your'e a legend!  Thanks for you

• Anonymous
  May 19, 2015
  it works, thks

• Anonymous
  June 03, 2015
  Fn a right

• Anonymous
  July 02, 2015
  The comment has been removed

• Anonymous
  July 21, 2015
  truly... this was the only real fix... I went through everything else listed in the microsoft help whatever.

• Anonymous
  August 17, 2015
  thanks very much    it solved my problem  

• Anonymous
  August 31, 2015
  Two years later and this fix is still relevant. Much thanks!

• Anonymous
  October 17, 2015
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• Anonymous
  December 17, 2015
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• Anonymous
  February 12, 2016
  The comment has been removed

• Anonymous
  February 20, 2016
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• Anonymous
  February 26, 2016
  OMG :))) Thank You... after many framework fehler....this was help =))

• Anonymous
  March 08, 2016
  thank you very much

• Anonymous
  March 09, 2016
  thank you so much!!! it's working!!

  • Anonymous
    June 28, 2016
    thank you，谢谢！

• Anonymous
  April 15, 2016
  Thanks! Finally after 8 hours of searching...

• Anonymous
  June 21, 2016
  Thank you soooooo much !!!

• Anonymous
  June 28, 2016
  So AWESOME!! it solved my problem , which have troubled me for almost two months!!!. thank you very much ....!!! thank you!