Recently I tried to run Oracle SQLDeveloper but I was getting the error that msvcr100.dll missing from your system. I tried with different JDK version but in vain. This can come while installing any other software as well. To resolve this problem just download and install Microsoft Visual C++ 2010 Redistributable Package. it will solve your problem. The following are download links as per your OS.
msvcr100.dll missing problem solved
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