I hope you're not really expecting a driver file being posted on this forum. You need to go to HP's website, navigate to Support area and find your printer model there. HP is pretty good with posting drivers on their site for people like you that need them.
In extremis, you could use the generic drivers that came with Windows, or even better, let Windows find and update drivers online for you. Win7 is pretty good at that.
here, I did some search for ya: http://h20000.www2.hp.com/bizsupport/TechSupport/Softwa...
but beware this is a XP driver, as your particular printer model is not supported in Win7. That means, no official drivers for Win7 and no official support from HP either, but it doesn't mean the XP driver doesn't work. Try it, you have nothing to lose.