重启系统就行了，对我有用。

给点时间再试一次。 在任务管理器中结束与visual studio相关的所有任务。 如果这两个解决方案都不工作，那么重新启动机器，它肯定会工作。

在Visual Studio 2017中，我必须结束这些过程:

Visual Studio 2017 TFS电动工具外壳扩展

然后我可以启动VS2017。

在我的情况下，我打开Visual Studio安装程序，看到它说

设置失败。单击“重试”继续。

我重新安装后，问题就消失了。

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.

在我的情况下，当我从任务管理器中检查时，visual studio的“vs_installershell.exe”仍在运行。在我结束了visual studio 2019正常开放的过程后。