Hello: I have installed unreal engine and when I create a project, when I open it the starter stays at 39% and the cpu goes up to 100% and does not open it.
a greeting.
And you need to… wait or search on google 
This is not even an issue, first loading of a project compile shaders, and yes, it can take a lot of time depending of your workstation performance.
I had the same problem. It was due to the large path of the project folder. Try to save project on a shorter path (i.e. d:\ue_projects)