First you need to have access to the server in which WCS is installed. Drop into the DOS prompt of the server (run->cmd).
Navigate to where WCS is installed and dive down into the "\bin" directory. The next order of business is to stop wcs. This is important and don’t cowboy this, because you may cause yourself some issues with the database if you don’t.
D:\Program Files\WCS6.0.132.0\bin\StopWCS
D:\Program Files\WCS6.0.132.0\bin\passwd root-user <PASSWORD>
Output:
----------
Initializing...
Updating root password.
This may take a few minutes...
Successfully updated root user
D:\Program Files\WCS6.0.132.0\bin\StartWCS