Another possible, if long-winded, solution is to load up a Linux distro (free - I'm using Ubuntu) to dual-boot with Windoze. I've had no problems using the "Simple Scan" program that comes with Ubuntu with any scanner I've tried. Then do all your scanning, save as JPEG or PDF, re-boot in W7 and carry on. A bit of a pest, but it does work, although I'd give Robin's solution a try first since most drivers are built in to most OSs.
Alternatively, my brother is a skip-hunter (American: Dumpster Diver I think) extraordinaire and frequently finds dumped all-in-ones with the printer function knackered. I don't advise our Bending Author to go crawling around his local tip, but I can look out for one if he likes. Failing all that, drop me an email, John, and see if Santa can deliver!