Thanks for clarifying how the IDE functions for all versions of UNO. How to I install the correct UNO R3.inf? Do I manually use the control panel>hardware>device manager>update driver to re-install the UNO R3.inf? And if I do that, how can I get my FTDI driver back to run my Duemilanove on the same computer?
If you installed it correctly the first time, it should be fine forever. But yes, that sounds like the correct way to reinstall the drivers. As for the FTDI drivers, your computer is smart enough not to try to run your mouse driver on a webcam, so it's smart enough to run your FTDI driver on a duemilanove and the other driver for your uno. It should "just work." If it doesn't, post back.