Do this if you're having problems!...
Go to Start > Run > Type in DXDIAG > After it loads click the display tab, you will see your graphics card listed. Look on the right hand side and you will see your drivers version. Go to your vendors site and check if there is a higher version number than your current that you can download..
If it's a geforce or nvidia go to >
If your card is a AMD/Radeon go to > http://support.amd.com/us/gpudownload/Pages/index.aspx
I didn't have to even restart to see the change fixed. You might want to restart after the update though.
On a side note, check under your sound settings and just make sure you have everything set correctly. (if you're using a headset that the jacks your are plugged into are set for priority). You might have a front side and back side audio input.
If you need anymore help or if I'm not being to detailed leave a post here. Sorry for not being too through, I'm pretty excited to play (:!