Error when I type php artisan migrate command in windows terminal

Error: After typing the command php artisan migrate in Windows :

  

Microsoft Windows [version 6.2.9200] (c) 2012 Microsoft Corporation.   All rights reserved.

     

C: \ Users \ x538238> cd C: \ xampp \ htdocs \ laravel

     

C: \ xampp \ htdocs \ laravel> php artisan migrate

     

In Connection.php line 664:

     

could not find driver (SQL: select * from information_schema.tables   where t able_schema = test and table_name = migrations)

     

In Connector.php line 67:

     

could not find driver

     

C: \ xampp \ htdocs \ laravel> composer update 'composer' is not recognized   such as an internal or external command, an operable program or a file   in batches.

     

C: \ xampp \ htdocs \ laravel >