There's a complete troubleshooting page on Microsoft's documentation for the emulator:
https://msdn.microsoft.com/en-us/library/mt228282.aspx
However I would recommend posting the full log in your question so it's easier to diagnose. Given a quick search, it seems to be a duplicate of this question:
转到Hyper V管理器,然后选择要运行的模拟器,然后右键单击->设置->处理器->那里的兼容性,确保选中“迁移到具有不同处理器版本的物理计算机”
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