can any body plz help me...?
You set the default storage engine in the MySQL configuration, but that will only apply to tables that are created after that point. You'll need to alter any tables that aren't InnoDB manually like this. If you have lots of data, this can take a while because it will create the new table, insert all the records and then drop the old table leaving this one in it's place.
ALTER TABLE table_name ENGINE = INNODB;
The easiest way is just to go to the mysql config file (my.ini in windows, my.cnf in Linux) and just add this: [mysqld] default-storage-engine=INNODB
This assumes that you have enabled InnoDB, which is another topic, but there are plenty of answers on how to do this. You can always check the default storage engine in phpMyAdmin on XAMPP: Just click on the server, then on engines, then on a particular engine (like MyISAM), and then see if it says "MyISAM is the default storage engine on this MySQL server".