Uninstall HTC sync, and htc sync driver from control panel. Delete all previous usb driver folders you may have downloaded from previous attemps. Power up and plug in your phone. Open device manager and uninstall the driver for whatever you see (ADB interface, bootloader, etc. -- whatever shows up. Click the checkmark for removing the drivers software files if applicable). Unplug your phone, and plug it back in. Yellow exclamation point? If no then repeat uninstalling the driver. Do this as many times as it takes until the phone is plugged in, you get the driver software failed to install windows error message, and there is a yellow exclamation point in device manager. Then Reboot your phone into recovery mode. Repeat the process here. Once done, reboot phone normally, install the hboot drivers from unrevoked 3.0, start the .exe.