Thanks Brink,
Netplwiz was part of the solution, but I could'nt sign in windows anyway, so couldn't use it.
I think I hit a bug in the first place so the following fix may not necessarily make sense:
From the login screen, select restart while holding the shift key, that will bring a menu...
Hello nice people !
Windows is asking me for a password despite I've never had a password.
Here's what happened:
I've never had a password and choose during the win install to have 1 local account without password.
I used to have a user/login name with an non ascii character (é), and it was...