If you change your password, or the git repository password is changed you can get the following error. In this situation you cannot make any changes or if it is a private repository even make a clone or pull.
Luckily there is a quick solution:
Navigate to:
Control Panel\All Control Panel Items\Credential Manager
Or:
rundll32.exe keymgr.dll,KRShowKeyMgr
Remove the git entry and try again (now you will be asked again for your username and password).
Voila!
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