Instructions to installing HTC Drivers on Windows8 64Bit:
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1. Download the Windows7 (64 Bit) drivers here -
Dev-Host - HTC_drivers_Win7_x64.zip - The Ultimate Free File Hosting / File Sharing Service
2. Unzip to any location you want. Just remember where you put them.
3. Plug in your phone to your USB cable.
4. Open your Device Manager (Windows Key + X and select Device manager) and locate HTC under Other Devices and right click on it and select Update Driver Software
5. Select "Browse my computer for driver software"
6. Click Browse and then select the folder you unzipped with the drivers in it then click next.
7. It should now install your drivers and then in your device manager it will now show up "My HTC" under Android USB Devices.