Sound no longer works after upgrade to Windows 8.1

System:

Operating System
Windows 8.1 64-bit
CPU
Intel Core i5 3330 @ 3.00GHz23 °C
Ivy Bridge 22nm Technology
RAM
8.00GB Dual-Channel DDR3 (11-11-11-28)
Motherboard
LENOVO MAHOBAY (SOCKET 0)18 °C
Audio
ASUS Xonar DGX Audio Device

I sucessfully upgrading to Windows 8.1 and everything was functioning after the upgrade.  However, after the first time I restarted my system after the upgrade the intergrated soundcard no longer worked.

I attempted to remove and reinstall the RealTek audio driver, downloading the newest 8.1 compatible driver from the Lenovo support site.

The drive refused to installed, either via the executable or by manually installing the driver through a device manager upgrade.  

So I attempted to install a stand alone soundcard, to no success.   

In device manager this is displayed for both the integrated motherboard audio and the new Asus sound card:

Windows cannot verify the digital signature for the drivers required for this device. A recent hardware or software change might have installed a file that is signed incorrectly or damaged, or that might be malicious software from an unknown source. (Code 52)

If I disable the driver driver signature enforcement, neither audio option works.  Instead I get this error in device manager:

"Windows cannot load the device driver for this hardware. The driver may be corrupted or missing. (Code 39)"

Attempting to update the driver in device manager, Windows tell me I am on the most up-to-date, recommended driver, yet at the same time refuses to allow it to function.

Extremely frustrating.

Any help would be greatly appreciated.