I seem to have the same problem.
Specific with windows7-32 bit pc.
I allready did try the 0022 software version
I did click on the Uno version in "board".
I did check the monitor (shows only com1)
In system/device manager: there is never anything at all under this port while the uno is connected.
The flip software from atmel i did try and was not the right version or..... i don't know
Also is their (atmel) high speed hot helpline very dead!!!