Error 25015.Failed to install assembly ‘D:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\AspNetMMCExt.dll’ because of system error: The process cannot access the file because it is being used by another process .

Error:

Error 25015.Failed to install assembly ‘D:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\AspNetMMCExt.dll’  because of system error: The process cannot access the file because it is being used by another process .

Snapshot:

Causes:

Microsoft .NET Framework installation was unable to dump the required file to its path, this may be because of following reasons

  1. Net Protector ( NPAV ) shield , may be scanning the system folders.
  2. Any other application may be using the files.

Workaround 1: 

Disable NPAV shield, and Retry.

Workaround 2:

Close all the running applications, and Retry.

Workaround 3:

Navigate to the displayed path in the error message, and rename the folder V2.0.5.727 to V2.0.5.727_old, and Retry.

 

 

 

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