Hi,
>>服务器上面预装的 WINDOWS SERVER 2012 R2 系统 , 登陆密码进去之后只有管理员命令提示符的界面
这个应该是您安装了 server core 版本的 2012R2 .
请尝试使用下面的powershell 命令:
Add-WindowsFeature Server-Gui-Shell
http://blogs.technet.com/b/gbanin/archive/2012/12/11/converting-a-server-with-a-gui-to-or-from-server-core.aspx
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