Yes re-install xampp
If you have any .sql files, you'll be able to import them into phpmyadmin and be able to recover tables etc depending on the file.
All your website files like .html & .php etc should go in the .htdocks directory.
If you find some of your things on your website do not work, it may be because of your php.ini file is reset to it's default from re-installation. So you'd need to update your php.ini file if that was the case.
Hope this helps!

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14 Year Old Programmer & Graphic Artist, Confident and Courageous
