Yet another "Gantt Project Won't Start on Windows 10" request for help

Hello, it seems my problem has been asked many times but I can’t solve my issue. I’ve installed GP this morning and I could work well for an hour.
As I was having a display issue I tried a change in an .ini file as advised somewhere in this help forum ([3.2] Display issue between 3.1 and 3.2). I could not restart, and the startup is blocked at displaying a frozen bee and the smiling penguin in the task bar. So I uninstalled , reinstalled, uninstalled again, tried to install Java, then liberica. Nothing changes.
Any idea ?