How do I reinstall OS X when computer wont boot up, or accept "C" command on start up.

I am missing some system files and my macbook pro wont boot up. I would reinstall OS X but it will not recognize the "C" command being held on start up, and I cannot figure out how to do it from Single User Mode. I am not worried about losing any files on the hard drive. How can I reinstall OS X?

If you cannot boot up using the disc that originally came with your computer, its possible the discs are damaged, dirty or your drive needs cleaning.  You can use a drive cleaner for that.
eplacement System Discs can be obtained from Apple's Customer Support - US (800) 767-2775 for a nominal fee. You'll need to have the model and serial number of your Mac available.
If you're not in the US, you may need to go through the regional Apple Store that serves your location to find the contact number - http://store.apple.com/Catalog/US/Images/intlstoreroutingpage.html

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