You download files for this kinda thing at
http://www.guru3d.com (or it might be
http://www.3dguru.com)
But, its painfully obvious you have no idea what you're doing (no offense) so do yourself a favor and do research first. Figure out what you're doing, or you'll be replacing your hardware. And, NO, asking us is not research!!
IMO, the gains you actually see in games by overclocking your vid card are minimal at best...