After reinstallation windows I can not enter into an account. The password Is required. I try to use the password received by me
in steam at game purchase - I receive the message that the password has already been used.
Ubisoft Support Staff NCSA
If you have already used your activation key with a Uplay account you will need to make sure that you are logging into the game using the original Uplay account.
If you are still experiencing problems you will need to contact technical support to help resolve your issue.