We need to install drivers for the Arduino Uno with Windows7, Vista, or XP on computer HP Pavilion dm4-1 1 60us Entertainment Notebook
( Notebbook has three types of USB's ports: generic, root and composite, unfortunately no any COM3 port)
We can't complete the following operation:
• Look under Ports (COM & LPT). Â You should see an open port named "Arduino UNO (COMxx)"
• Right click on the "Arduino UNO (COmxx)" port and choose the "Update Driver Software" option.
• Next, choose the "Browse my computer for Driver software" option.
• Finally, navigate to and select the Uno's driver file, named "ArduinoUNO.inf", located in the "Drivers" folder of the Arduino Software download (not the "FTDI USB Drivers" sub-directory).
• Windows will finish up the driver installation from there.
By the way, on my desktop Windows computer, the serial port is always COM3 - at works properly.
Please help, Eli