When trying out Flashpaper 2, after having already installed Macromedia Contribute 2, on a Windows 2000 machine, things got hopelessly confused.

The driver for the earlier version was still in place, and the new driver would not install. Attempting to use regedit and the Add/Remove Programs control panel did not help. I was able to remove everything, and reinstall Flashpaper 2, but the printer driver simply would not install, therefore documents could not be converted.

Solution:
on the Macromedia Forums, I found this advice:
Go to this link and download the zip file. It contains an installer specifically for the printer driver.
It works!