Critical Errors (PDO Class not Found)

[LucasA33]

Warning: include_once(classes/class_pdo.php) [function.include-once]: failed to open stream: No such file or directory in /home/mineedit/public_html/game/functions/functions.php on line 50

Warning: include_once() [function.include]: Failed opening 'classes/class_pdo.php' for inclusion (include_path='.:/usr/lib/php:/usr/local/lib/php') in /home/mineedit/public_html/game/functions/functions.php on line 50

Fatal error: Class 'PDO' not found in /home/mineedit/public_html/game/classes/class_database.php on line 3

Happens on both my main site: game.pixelcore.tk and mobile.game.pixelcore.tk

Cannot seem to locate files to fix it, as I restored the classes, and functions folder to it's previous backups; and did check the databases in phpmyadmin, everything seems to be OK.

As for script modifications, only minor ones to edit the sidebar, and such.
This just happend. I didn't even touch the script days before this happend.

I can't access any of the site.