Well...if it worked before and doesn't now then you may need to reset your prefferences. Hold down CTRL+ALT+SHIFT as soon as photoshop begins to load. Then click YES when asked if you want to delete your preferences. That should do the trick

If photoshop never worked then you most likely have a stolen copy or an attempt at a stolen copy, in which case...it's most likely non-functional to begin with and I wouldn't offer help even if it was repairable.

If this is a legit copy of photoshop and resetting the prefferences doesn't work then contact adobe for help. www.adobe.com