error message

I am trying to install Moodle from the Windows Web app pages and the installation fails with the error message : The specified password for user account 'SA'/'root' is not valid or failed to connect to the database server. The potential solutions offered below do not work. Any help gratefully received 

1. The password you entered may not match the required security  settings of SQL Express or MySQL. The following articles detail the password strength requirements:
   1. SQL Express:
      • MySQL: No complexity requirements
2. The password that WebMatrix or WebPI has stored does not match the database you are trying to connect to
   1. Delete the reg key that is storing the password (hashed) and try the install again
   2. Delete the mysql_pwd or sql_pwd key stored at HKCU\Software\Microsoft\WebPlatformInstaller