How do you reinstall a launch command that has been deleted?

I have a Macbook and foolishly, sometime ago, accidentally deleted a launch command (I think). I can no longer update any firmware or software and none of my usb drivers work. Is there a way I can reinstate the command? Or should I take it to someone who knows what they are doing?

MacBook, OS X Mountain Lion (10.8.5)

Posted on Nov 18, 2014 1:48 AM

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How do you reinstall a launch command that has been deleted?

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