The Fail Code is: Unknown USB device (Device Descriptor Request Failed)
Windows has stopped this device because it has reported problems. (Code 43)
So I found a German solution where you have to go to regedit.
Step 1: You need to install the HTC drivers (Google, Samsung etc...) in the normal mode your PC will find your phone, but when you turn into Fastboot you get that error "Unknown USB device (Device Descriptor Request Failed) "
Step 2: Make sure you see that error in your Device Manager under USB - Controller
Step 3: Open "regedit"
Step 4: Navigate to : HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Contro l\usbflags
Step 5: Create a new Key called
Step 6: In that Key you create a Binary Value
Value: 01 00 00 00 (ignore the "0000" at the beginning)
Step 7: Reconnect the Phone and enjoy your FIX
I hope I helped you. I can just tell you that it worked for me. I m not sure if it works on all HTC devices.