I\'m working with several repositories, but lately I was just working in our internal one and all was great.
Today I had to commit and push code into other one, but
In Windows 2003 Server with "wincred"*, none of the other answers helped me. I had to use cmdkey.
cmdkey /list
cmdkey /delete:Target
(* By "wincred" I mean git config --global credential.helper wincred)
git config --global credential.helper wincred