ERROR 1146 Table 'mysql.root' doesn't exist

[javier_enithost]

Hola :

mysql> select host,user,password from user;
+-----------+------+------------------+
| host | user | password |
+-----------+------+------------------+
| localhost | root | 67457e226a1a15bd |
| localhost | | |
+-----------+------+------------------+

Entra a tu mysql hasta el mismo lugar donde realizas esta consulta.

Luego ejecuta,
UPDATE user SET password='' WHERE host='localhost' AND user='root';

Saludos