Preparing adb/fastboot drivers on a Windows computer

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Step 1: Download the driver

Download from this page: http://developer.android.com/sdk/win-usb.html
Extract the zip file, the file that you want is called android_winusb.inf, notice where to find it.

Step 2: Install the driver

1. Open a program on the computer called Device Manager. See notes below if you need help finding this program.
2. Connect the Nexus device to the computer's USB port (preferably USB 2.0, you can find these as "white" USB ports). A new entry will pop up on Device Manager's middle pane, pay attention to find it (preferably this should be Other devices). Unplug and replug if you need to.
3. Click on the triangle next to that new entry to expand it. Right click on the device name (likely to be Nexus 7 with a yellow exclamation mark) and select Update Driver Software.
   See this screenshot for steps 2-3: http://i.imgur.com/LDMc4gP.png
4. Select Browse my computer for driver software and click Next.
5. Select Browse... and go to the folder with the file android_winusb.inf, then click OK and continue to install the driver.

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Notes: Under Windows 8+, the program you're looking for is called Device Manager. You can either:

• search for it (hit Windows key and type in Device Manager), or
• right click the Start button (Windows 8.1 only, sorry) and choose Device Manager, or 
• follow the steps below:

1. Open a file browser, right click on "My Computer" or "This PC" or whatever that has the icon of a computer. Select Manage. See: http://i.imgur.com/lazF9YC.png
2. On the left pane of the new window, find Device Manager or Devices if you're on Windows 7 or below. See: http://i.imgur.com/HmfM0gF.png

Moar Notes: I might do a video guide for this to show the sunny day scenario. Should be easier to follow as long as everything goes right for you.