Since the software may not be able to understand the new NT6.2(Win8) it may be part of the problem.
You may want to go look in your C:\SWSETUP\SP45166\ folder and see if you can manually install the drivers from the device manager.
From the device manager(devmgmt.msc)
Hold Start+R and type devmgmt.msc and hit enter.
Right click the sound card and select Update Driver Software
Browse My Computer
Let me pick......
No goto the C:\SWSETUP\SP45166(or 28481 if you want to try that driver)\W7-(32 or 64 depending on the version of 8 you have) and select WAHERwa.inf
See if this works for you. You will most likely get a message about the driver not being made for your version of windows, you can continue anyway.
INF files also contain different directions for different versions of windows(NT6.0 Vista | NT6.1 Win7| NT2.2 Win8). I am hoping that it is close enough for you to at least get sound.
Failing that, I guess you could try to edit the INF file, but that is another story.