Thank you so much for your reply Casti_EL, it was so kind of you to help me with such depth.


So it only crashes when logging on your machine but works fine on your friend's machine? If so then it sounds like a hardware/software issue rather than an account issue.
=> Yes. After choosing the character I want to play in selection menu, it suddenly crashes for me


Have you tried creating another character and logging in?
=> I have tried, and from another account, but it crashes as well upon login


"Documents\My Games\FINAL FANTASY XIV - A Realm Reborn"
=> I had never tried to do anything about this file before reinstalling, do you think I should delete it, then reinstall all game ? Or not necessary ? I ask before reinstalls take 10h+ with my internet

FFXIV support will require system information which can be gathered via the options menu in your game launcher.
=> I will try to gather that after I finish my current reinstall; thank you so much