I am having issues with installing drivers for my Arduino Uno. I had previously installed the drivers and everything was working fine but the other day i turned on my computer and wasn't getting any connection to the arduino.
I tried uninstalling and reinstalling the device, but now I am getting an error when installing the drivers (please see screen shot below).
System Details:
HP Z-Book
win 7, 64 bit
Arduino Uno
Arduino software version 1.6.5

Also, When installing drivers I used the steps listed below and I also tried following the steps in the "Getting Started" instructions.
- In Windows, the device manager indicates an "Unknown Device."
- Hovering the mouse over "Unknown Device", right click and choose "Properties."
- A window pops up displaying three tabs (to know you are in the right area). Under the "General" tab click the button "Update Driver."
- Another window pops up and gives you two choices, a) have the computer look for update drivers; and b) browse manually for the drivers, click "manually look for drivers".
- Another window pops up to direct you to the folder for the new drivers. At the bottom of this window there is a green arrow pointing to "Let me pick from a list." (This action is not updating drivers per say, but telling Windows 7 to add a device and therefore add the drivers). Click on this button.
- The next window lists devices already in Windows database. At the top of this list "Show all devices" should be highlighted, if not highlight it by clicking on it. At the bottom of this window click "Next".
- The next window again lists Manufacture and Model. At the bottom there is a button with "Have disk". Click this button.
8.) As stated above, maneuver to the folder that you have downloaded from Arduino's web site in which you have installed. Within this folder there is a subfolder called "Drivers". In drivers there is a file called "Arduino Uno REV3" (among others).
- Clicking this file will solve the "Unknown Device" and Windows will recognize your new Arduino board.

I am doing research on a story like this. And would tell everyone to understand.
I tried a few different things yesterday, heres what has changed.
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I tried uninstalling the arduino software and installing the hourly build version, hoping that there may be a recent bug fix
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I tried clearing out my registry and reassigning the arduino to a different com port.
Now, i have the Code 10 error: "this device cannot start". But, the arduino ide shows that the board is connected and when i try to upload the blink program i get this error:
avrdude: ser_open(): can't open device "\.\COM5": The system cannot find the file specified
After doing some searching, i am wondering if this is related to an issue with the serial driver on the board?
Any "expert" input would be greatly appreciated.
-Chris
BUMP
Ive tried using different cables and uninstalling/reinstalling, still no luck.
When i try to install the drivers it says it has found the driver but cannot connect to the device (CODE 10).
I don't really understand why this is happening because everything worked great for about two weeks before i started having issues.
please help
I have uploaded the relevant parts of the setupapi.dev.log file from C:\windows\inf
setupapi.dev.log-ARDUINO.txt (21.8 KB)