HWID is Hardware ID Ban. They ban your HDD's / Graphics Card's Hardware ID. You can find a spoofer. See HWID & XUID Spoofer on google.
This overrides IP Ban, MAC Address Ban, GUID (Global User ID) Ban, UUID (Universal User ID) Ban etc. But as always Spoofers are all around.
Spoof your HDD's HWID and change it. Its easy. Or else you can re-install Windows and it will change your ID.