priviledge error in php myadmin database

actually when I was working with php my admin I accounted a new problem.In phpmyadmin i opened peiviledge
tab it was having all the privilege. As on experimenting with privilege it lost all the privilege now I am fetting this error
on privilege tab:
User overview

No Privileges
more over there is no database in the database table I lost all the database and in the prossesses I am getting this error:

#1227 - Access denied; you need (at least one of) the PROCESS privilege(s) for this operation
there is no way I can give the previlige
I tried with tis too
mysql>GRANT PROCESS ON your_db_name.* TO your_username@localhost IDENTIFIED BY your_password

actually the point is I need my database back in php my admin
any it was there in D:\xampp\mysql\data
please can any one help me out .

thanks and regards

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