I am getting the same message (Win7,64bit) and in device manager shows as unknown device and wont download from Arduino/driver
changed USB cable as well; went to laptop (WinXP) hoorah! downloads driver for R3 Uno but then doesnt recognise .pde files from evilgenius-?
The win64 machine imports .pde files perfectly but wont upload to Uno.
Have googled, watched several setup videos and read a lot of this board and I`m at wits end (buying a Mac seems a bit extreme for a £30 board)
Am I being an obvious noob?