am using Windows 8.1 Only using the USB cable for powering and downloading the Arduino Uno. The green LED is on and steady. The yellow LED is blinking. I go to Device Manager. Arduino is listed as unknown Device. Driver not installed Code 28 (Location Port_#0003. Hub_#0003) I click on Update Driver (Browse from my computer) Give location: c:\Program Files (x86)\Arduino\drivers It reads: Installing driver software. The green bar shows loading. Message appears: Windows encountered a problem installing the driver software for your device. Windows found driver software for your device but encountered an error while attempting to install it. Arduino Uno A problem was encountered while attempting to add driver to the software store.
I run Arduino 1.0.5 software (also tried Arduino 1.0.4, still does not work) I select tools - Board - and select Arduino Uno In tools menu, Serial Port is dim (not selectable) I go to File/Examples/01.Basic/Blink and click upload. It says Compiling Sketch Then message appears: Serial Port COM1 not found. Did you select the right one from the Tools menu? I want to select COM3, but the Serial Port option is not selectable. Please help.