I'd agree wholeheartedly with what the others have said. You're not going to get a pin sharp photo from that.
On the other hand, if your heart is really set on using it, take a look at
www.focusmagic.com. I've always been fairly skeptical, but after a dodgy lens left a number of important wedding group photographs even more blurry than your picture, I downloaded the demo. The effect is far from ideal, but combined with a noise reduction plugin, it's much better than we started with. Might be worth a try!