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How do I install the Arduino drivers in Windows 7?

The .inf file driver installation is very different in Win7 than in XP.  In XP you are prompted for the drivers, which are installed in Program Files\Angstrom Designs\LarVa_subRoutines\drivers.  In Win7 sometimes if the drivers aren't found Windows 7 just lets the device be on the system without drivers.  Unfortuneately, it all depends on your settings. 

To find out, go to the device manager:

  1. Right click on Computer
  2. Select 'Properties'
  3. Click 'Device Manager' in the list at the upper left

If you see your Arduino under Ports, called out with the correct Arduino name and a COM port, then the drivers are installed correctly.

If you see your Arduino under Other Devices with a yellow warning flag on the icon, then you need to installed the drivers:

  1. Right click on the Arduino device and select update driver
  2. Click "Browse my computer for driver software"
  3. Browse to the driver folder:  Program Files\Angstrom Designs\LarVa_subRoutines\drivers
  4. Click Next.
  5. Windows 7 should find and update the Arduino drivers.  Click Done.

Back in Device Manager your Arduino should show up under "Ports."  Now you can run LarVa Simple Graph.

If you have an Uno Rev. 3, don't forget to get the updated drivers.