我清除了%temp%文件夹，并重新启动VS2017。 开始工作很好。

很可能Visual Studio正在更新，就像错误消息暗示的那样，如果你等待几分钟更新完成，你应该能够再次运行Visual Studio而没有问题。

If the problem persists or if you're just curious, open up your task manager and see if there is anything related to (Microsoft) Visual Studio running but don't just kill the process. Check instead if the process is using any resources - if it has a high I/O count, then it's actually updating and you should let it do its thing. If CPU-usage and memory usage remain mostly constant and there is no disk activity for the process for several minutes, this could mean that the process is stuck. You might have to kill it, but proceed with caution. Hopefully if this is an update for Visual Studio, the process name should include a version number or some sort of indication of what kind of update is being applied that you can use to search for more information through a search engine or through Microsoft's online resources.

不完全是对最初问题的回答，但如果你真的需要在安装过程中运行VS，你可以使用未记录的/AllowDuringSetup命令行开关(风险自负)。

重启系统就行了，对我有用。

原因是一个待定的Windows更新。Windows更新后，Visual Studio启动没有任何问题。

在我的案例中，Visual Studio在没有询问任何确认或显示警告的情况下自动关闭。

不要停止这个过程。等待5到10分钟。Visual studio将自动启动。