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[on:]

I have a FINAL SOLUTION  for this infamous, misterious, damned error.
I verified multiple times that one cause may be using the same USB port used for Arduino programming also for "something else" such as connecting an USB drive, card reader or what else.

SOLUTION:
right-click on Arduino UNO.inf and INSTALL it again, and do the same with FTDIBUS.INF (they're located in \drivers folder in Arduino IDE folder).
This will make your computer "forget" about the USB device and see again the Arduino.


I think this should be added in the error knowledge base for Arduino.

[Reply #1 on:]

Hi,  I'm very new to arduino and I am experiencing the same error using an UNO.  I attempted to install the UNO.inf and FTDIBUS.INF as you described, however receive this error:
Install Error
The INF file you selected does not support this method of installation.

Could you explain further on how to re-install it?
Thanks.

[Reply #2 on:]

I guess it's a matter of Operating System: my method works on Windows XP, I don't know how ".inf" files are installed in Vista/Seven. I guess you should ask in a specific Windows forum, or try repeating these steps:
http://arduino.cc/en/Guide/Windows#toc4