Hello, I have a problem with Unity Editor, I can't open a project. When I try to open old projects it freezes and loads forever and when I want to create a new project the window closes as usual but then the editor never appears. It's running as a background app but I can't do anything. I tried uninstalling but it doesn't change anything. Could someone help ? I have version 5.4.0 because it's the one I was using on school's computers.