Vegas无法采集，按钮灰色，不可用
Vegas：1394连接到摄像机，出现“自动播放”对话框：您想让Windows做什么？所有播放录影按钮呈灰色，不可用。
软件提示：Sony Video Capture :
The device"Microsoft DV Camera and VCR" could not be opened.
Please make sure that it is turned on and is not being used by
another application or user.
不知哪里出问题？请各位高手和老师指教！！！