SYMPTOM
When installing Oracle 12.1.0.2 32bit client onto Windows Server 2012R2, the following error occurred.
SOLUTION
1) Click “..\winnt_12102_client32.zip\client32\stage\ext\bin\vcredist_x86.exe” and install “Microsoft Visual C++ 20xx Redistributable Package (x86)”. Then click “Retry again” to complete the installation successfully.
OR
2) Before installation, change “”..\winnt_12102_client32.zip\client32\install\oraparam.ini”. Then start the installation.
From :
MSVCREDIST_LOC=vcredist_x64.exe
TO;
MSVCREDIST_LOC=vcredist_x86.exe
Make DBA Life Easy 
you are the best! that was the only solution that worked!
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Thanks julio for reading my blog, and thanks for your warm comment.
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Having the same problem “[INS-20802] Oracle Net Configuration Assistant failed” and trying to install many times Oracle12cR2 on Windows10. I installed Oracle12cR1 without problems, so I realized that “vcredist_x64.exe” file is even latest than the file I downloaded before from Microsoft webpage.
In this case, I uninstalled Oracle12cR1 and Installed again the Oracle12cR2 version, but using the vcredist_x64.exe that came together in the installation of Oracle12cR1.
Doing this, I was able to install the Oracle12cR2 without problems on Windows10.
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cool. Thanks for sharing with us.
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I am getting the same problem but in windows 8.1, what should i do to remove INS 20802 error
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Try the same to see what happens.
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