Downloads
Hboot Drivers
Install the Hboot drivers:
Extract your hboot driver files somewhere you will remember.
Boot into Hboot screen (from off, hold volume down and press power)
Connect Desire to PC (the screen will then show "HBOOT USB")
Right click "My computer" > Manage > Device Manager
Expand "Other Devices" in the right-hand pain and locate "Android 1.0 device"
Right click on Android 1.0 and click Update Driver Software
Click on Browse my computer for driver software.
Click on Browse and select the Android USB Driver folder you extracted earlier (press OK to any errors received and Close when complete)
Check Android Bootloader Interface is listed under Android Phone in device manager.