虚拟系统一启动就提示Cannot connect virtual device sound. No corresponding device is available on the host.
Would you like an attempt to be made to connect this virtual device every time you power on the virtual machine?
声卡那里是AUTO DETECT，并且呈灰色，无法作修改！
另外，装上USB时虚拟系统提示有硬件输入，但是没法正常启动。设备管理器里面有黄色叹号！望指教！
