Reset SQL Server sa password I need to recover my SQL Server 2008 user/pwd. 

The situation is: I don't know the SA password and Windows Authenticated user is no longer active user (disable user because the user has left job) so I can not log in using Windows authentication.

Is there anyway to reset the sa password, Windows authentication and to log in to the database?

Last option could be uninstall and install again. In this case data will be lost.

Thanks,
Follow the steps in Connect to SQL Server When System Administrators Are Locked Out:


start the server in maintenance mode with -m
connect as local administrator
add necessary accounts
restart the server in normal mode


Is all described, with detail step-by-step, in the linked article.