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?