安装之前要保证已装Microsoft Visual C++ Redistributable
32 bit: http://www.microsoft.com/download/en/details.aspx?id=5555
64 bit: http://www.microsoft.com/download/en/details.aspx?id=14632
需要选择相应的版本安装。
不然会安装失败，且sqlplus运行会报错：
"The program can‘t start because MSVCR100.dll is missing from your computer. Try reinstalling the program to fix this problem."
原文：http://www.cnblogs.com/which/p/4671279.html