Currently, I did a re-installation of my windows 10. I also installed Git and TortoiseGit.
Right now when I try to check diffs I have theses two errors in a window:<
TortoiseGit 2.5 is not yet fully compatible to Git >= 2.16. See https://TortoiseGit.org and the corresponding bug report: https://TortoiseGit.org/issue/3138
Update: Use the latest stable version of TortoiseGit: https://tortoisegit.org/download/