Second law of thermodynamics is applicable to information, too. Next time, be more careful.
If I understood you correctly, you've used a file shredder. Such utilities are designed to produce irreversible changes to files. You may need to get the fonts from the system installation or some healthy system and install them back. In some severe cases, re-installation of OS may be the best option. Anyway, you should be always ready to such disasters, backup your data, and so on.
—SA