OSX / 9.2 woes


Hi guys, hope you can give a total noob a hand with this.

I'm running on OSX. The other day I was doing some work when my program crashed for no apparent reason, so I reset the computer just to make sure everything was ok and all of a sudden it will only boot into my old 9.2 operating system. The HD is still as full as it was previously, just nothing is visible on it. I was just wondering if there was any simple way to just pop the computer back into the OSX mode, and soonish if possible.