Trying to install the driver and you can't see your device listed?
I just tried installing the Google USB Driver for Windows 7. When I got to the step about selecting the device in the device manager, I saw that my phone wasn't listed. I tried disconnecting and reconnecting the USB cable to no avail. Then I noticed Windows was notifying me that the device driver didn't install correctly. I disconnected the phone, shut it off, turned it back on, and then connected it once it was fully booted. Voi-la! Success!
However, I didn't actually have to do anything after that. Windows said the driver was already installed. And my Android device disappeared from the Other Devices list, and instead appeared under a Portable Devices list as F:\. So I went to the <sdk>\platform-tools directory and ran "adb devices" which listed the device. It was some weird ID number like SH97BP401359.
Happy Hardware Testing!