When you open the XAMPP and click start MySQL button and it showing this type of error.
You should, first try using the MySQL backup which is included with XAMPP
1st you have to rename folder mysql/data to mysql/data_old
Then make a copy of mysql/backup folder and name it as mysql/data
Copy all your database folders from mysql/data_old into mysql/data (except mysql, performance_schema, and phpmyadmin folders)
Copy mysql/data_old/ibdata1 file into mysql/data folder
Start MySQL from XAMPP control panel
may its help you
