How to repair .NET framework 4 installation on Windows 8

My mscorlib.dll seems to be corrupt. I tried reinstalling from the standalone .NET 4 installation package, but .NET 4 is integrated into Windows 8.1. Is there a way to repair it?

I have tried System Restore and sfc. They did not work.

I know I can reinstall the system, but I would like a less painful solution.

Answer

I manually copied the corrupt file from a different computer with the same Windows installation. It took some permission changing, but I managed to replace the file.

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