Cambia el collation de la base de datos, y revisa que el de las tablas y campos se haya cambiado. Si no, lo tendrás que cambiar campo por campo (probablemente con un script)
 Cita:  
					Iniciado por SQL BOL's  Changing Collations
You can change the collation of a column by using the ALTER TABLE statement:
 
CREATE TABLE MyTable
  (PrimaryKey   int PRIMARY KEY,
   CharCol      varchar(10) COLLATE French_CI_AS NOT NULL
  )
GO
ALTER TABLE MyTable ALTER COLUMN CharCol
            varchar(10)COLLATE Latin1_General_CI_AS NOT NULL
GO
 
You cannot alter the collation of a column that is currently referenced by: 
 
A computed column.
 
 
An index.
 
 
Distribution statistics, either generated automatically or by the CREATE STATISTICS statement.
 
 
A CHECK constraint.
 
 
A FOREIGN KEY constraint. 
You can also use the COLLATE clause on an ALTER DATABASE to change the default collation of the database:
 
ALTER DATABASE MyDatabase COLLATE French_CI_AS
.....