Hi there, just wondering whether you solved your problem - i'm having the exact same problem with my 600cu scanner. I just bought a new comp with Windows XP on.
However, I have already tried the link that alan14 provided you with - but it didn't work for me. Even when I went into the Registry Editor to change the ProduktName - I discovered that mine was alredy set to Microsoft Windows 2000 as opposed to the other way round. (Plus, when i even tried to load the Windows XP Tool, an error box kept coming up saying that this tool only works with XP - YET MY COMPUTER IS XP).
Very frustrating - did you get any better results with yours and if so, what did you do to solve it?
Hope you sorted out your problem - if not, I've just had success with mine. I used skidzy's link and downloaded the Windows 2000 "WEB.EXE" file to "My Documents". Once I clicked on it and installed it into the computer, I went into Device Manager, found my scanner listed with an exclamation mark by it (under imaging devices), and right clicked so that its properties came up. When i looked at those, and at the "Drivers" tab, it actually listed 2 drivers there for some reason (possibly the first one that was not recognised, but it would seem the one I downloaded from skidzy was the next one available so I clicked that and voila - the driver installed correctly and my scanner works fine now - hope yours does.