Remove bulk orphan user

DECLARE @username varchar(25)
DECLARE fixusers CURSOR
FOR

SELECT UserName = name FROM sysusers
WHERE issqluser = 1 and (sid is not null and sid <> 0x0)
and suser_sname(sid) is null
ORDER BY name

OPEN fixusers

FETCH NEXT FROM fixusers
INTO @username

WHILE @@FETCH_STATUS = 0
BEGIN
EXEC sp_change_users_login 'update_one', @username, @username
FETCH NEXT FROM fixusers
INTO @username
END

CLOSE fixusers
DEALLOCATE fixusers\