You could try the drivers from this individual, who went in and made changes to them and the other software that fixed stereo upmixing, and all kinds of latency bugs caused by the crappy drivers:
From reading what he put in the descriptions, this might fix your issues.
You could also try Daniel K's Asus Xonar drivers, updated for Win7 and Win8 use: http://danielkawakami.blogspot.com/
I tried installing the xonar unified drivers, wow what a hassle.. "Please insert your xonar device"
"Can't find the sound card" "Sound service isn't running". Got it working though, anway I started SWTor up with the Windows XP SP3 compatability mode checked on, guess what? :P
If you guessed "no sound" then you are correct! You guys don't have to try anymore I just give up, thanks for the help anywho and for trying.