While Microsoft officially lists it as "Not compatible," here's what I found on the subject:
http://www.frisno.com/2009/11/konica...orks-in-vista/
The post says the same patch works in Win7.

Vuescan may well be the best way to go. Sorry I'm not much more help on the Windows front. I've been using this on various Macs running OS X since I bought it.