I'm not having any luck communicating with the phone when it's in fastboot. When I the phone is in fastboot and connected to the computer via USB, the computer says "USB device not recognized", etc. Not a good sign, and I don't know how to install the driver. And then when I issue the command "fastboot devices" from the cmd prompts, the devices don't display. The cursor just comes back at the DOS prompt. There is no error message.
The phone connects to the computer and accepts adb shell commands with no problem if it's not in recovery mode.