在 Windows 平台下安装 Ruby 需要先有 Ruby 安装包，大家可以到 Ruby 的官网（http://rubyinstaller.org/downloads）下载对应需要的 Ruby 版本。是不是64位的电脑选ruby 2.1.5 x64的那个就好？
The 64-bit versions of Ruby are relatively new on the Windows area and not all the packages have been updated to be compatible with it. To use this version you will require some knowledge about compilers and solving dependency issues, which might be too complicated if you just want to play with the language.
不想麻烦还是装32位的吧
这个应该看你的操作系统是几位的，如果是64位肯定是安装64位的更好。