If you get an error when you double-click the Arduino icon, or if nothing happens, try double-clicking the Arduino.exe file as an alternative method to launch Arduino.
Windows users may also run into a problem if the operating system assigns a COM port number of COM10 or greater to Arduino. If this happens, you can usually convince Windows to assign a lower port number to Arduino by freeing up (temporarily) a COM port with a lower number.
First, open up the Device Manager by clicking the Start menu, right-clicking Computer (Vista) or My Computer (XP), and choosing Properties. On Windows XP, click Hardware and choose Device Manager. On Vista, click Device Manager (it appears in the list of tasks on the left of the window).
Look for the serial devices in the list under Ports (COM & LPT). Find a serial device that you’re not using that is numbered COM9 or lower. A modem or serial port make good candidates. Right-click it and choose Properties from the menu. Then, choose the Port Settings tab and click Advanced. Set the COM port number to COM10 or higher, click OK, and click OK again to dismiss the Properties dialogue.
Now, do the same with the USB Serial Port device that represents Arduino, with one change: assign it the COM port number (COM9 or lower) that you just freed up.c
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