Sounds like a driver issue.. If you've already tried the latest available Windows Vista driver for your printer and any Windows 7 specific drivers that may have already been released for it and they aren't working then your just going to have to wait until another Windows 7 driver or a fix is released from the manufacturer.. Remember, Windows 7 is still only in RC stage's, meaning there will be some devices that no matter what you try they just aren't going to work yet..
The Vista drivers from Jan 2009 (or earlier) do not work in Win 7. This doesn't seem to have changed in 7100. The driver will install fine, but will crash the print spooler when you try to print anything. I have not been able to get any combination of compatibility mode to work unfortunately. Kodak is aware of the issue and they are releasing Win 7 Drivers soon.