SSH, Windows and Vagrant

Hey guys,

I have an issue.
I accidentally deleted the wrong SSH key pair, and since then I can’t reload my VM.

I regenerated my keys with the ssh-keygen -t rsa command but now I got the error message : " Warning, authentication failure in gitbash" when I try “Vagrant reload --provision”.

I can only go to Virtualbox display, using as login/pw “vagrant”

Does it have anything to do with known_host or authorized_keys configuration ?
I only have these 2 files in my folder ~/.ssh/
How could I solve this ?

Edit : I have id_rsa and in c:/users/romain/.ssh/

Thank you for your help!