Virtual PC 2007 虚拟网络不能启动

参见：http://kbalertz.com/834310/network-adapter-computer-loses-connectivity-start-virtual-machine-Virtual.aspx

症状是，启动Virtual PC后显示
Virtual PC could not open its emulated Ethernet switch driver. Virtual switch networking will be disabled. To fix this problem, re-enable the Virtual PC Emulated Ethernet Switch service or reinstall Virtual PC.

而且似乎开虚拟机一段时间后还会影响到宿主机的网络连接

原因为Virtual Machine Network Services没有安装好

解决方法：
1.打开网络连接，找到本地连接，右键->属性。
2.如果此时“此连接使用下列项目”中有Virtual Machine Services，则把它删除，否则转下一步
3.安装->服务->添加->从磁盘安装->选择\Utility\VMNetSrv

之后应该就可以了
另外进行上述操作时最好关掉跟网络连接有关的程序。

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