当我尝试安装时VirtualBox 4.1.6，安装结束时它会说Rolling back action，删除所有以前安装的文件，然后安装程序会给我以下消息：Oracle VM VirtualBox 4.1.6 setup ended prematurely because of an error. Your system has not been modified. To install this program at a later time, run Setup wizard again.