Google USB Driver

https://stuff.mit.edu/afs/sipb/project/android/docs/sdk/win-usb.html

Downloading the Google USB Driver

The USB Driver for Windows is available for download as an optional SDK component. You need the driver only if you are developing on Windows and want to connect an Android-powered device (ADP, Nexus One, or Nexus S) to your development environment over USB.

To download the driver, use the Android SDK Manager tool that is included with theAndroid SDK:

1. Launch the Android SDK Manager by double-clickingSDK Manager.exe, at the root of your SDK directory.
2. Expand Extras.
3. Check Google USB Driver package and click Install.
4. Proceed to install the package. When done, the driver files are downloaded into the<sdk>\extras\google\usb_driver\ directory.

For installation information, read Installing a USB Driver.