For any of those playing AC3, and having no character voices coming up, try switching from 5.1 audio setup to a different sound configuration, it worked for me!
Case - Cooler Master Storm Enforcer
Motherboard - Crosshair V Formula
CPU - FX-8150 3.6GHz ( OC'd to 5.4)
CPU Cooler - Corsair H70 (2 gentle typhoon fans)
GPU - ASUS Radeon 6850 HD 1GB
RAM - G.Skill Ripjaw X series (2x4gb) 1600 (OC'd to 1725)
PSU - Seasonic 860w platinum
HDD - Seagate Barracuda 500gb
SSD - Corsair Force Series GT 120 GB
OS - Win. 8 Pro 64 bit
