Hyper-V是微软的一款虚拟化技术，是微软第一个采用类似Vmware和Citrix开源Xen一样的基于hypervisor的技术。

在Windows 10的powershell命令里，输入如下的命令行：Enable-WindowsOptionalFeature -Online -FeatureName Microsoft-Hyper-V -All

遇到如下错误信息：

Enable-WindowsOptionalFeature : Enable-WindowsOptionalFeature failed. Error code = 0x800f0831

Microsoft-Hyper-V Error code = 0x800f0831

At line:1 char:1

Enable-WindowsOptionalFeature -Online -FeatureName Microsoft-Hyper-V …

CategoryInfo : NotSpecified: (???? [Enable-WindowsOptionalFeature], COMException

FullyQualifiedErrorId : Microsoft.Dism.Commands.EnableWindowsOptionalFeatureCommand

再试试第二个命令行：

dism /online /enable-feature /featurename:microsoft-hyper-v-all /All

还是遇到错误码0x800f0831:

The DISM log file can be found at C:WINDOWSLogsDISMdism.log

解决办法是，进入Windows 10的控制面板，在Turn windows features on or off里先安装.NET Framework:

之后就能安装Hyper-V了。