Go to the control panel then Hardware and Sound then to Manage audio devices then right click and choose speaker properties then go to the advanced tab. Choose the "16 bit 48000 hz (DVD Quality)" This will get the sound working in your Windows Media player.
With the new Win build the default setting has changed so DVD's won't play sound in WMP unless you do this first.
Computer type PC/Desktop System Manufacturer/Model Number Home built OS Windows 7 Ult, Windows 8.1 Pro, CPU Q9650-4.275GHz, E8600 4.5GHz, E6750-3.8GHz Motherboard Evga 780i FTW Memory G.Skill PC2 9600 1200Mhz 5 5 5 15 2T Graphics Card GTX480 Sound Card Asus Xonar D2 Monitor(s) Displays HannsG Screen Resolution 1680X1050
Keyboard Logitech G15 Mouse Logitech G9 PSU ThermalTake Toughpower 1000Watt modular Case ThermalTake XaserV Cooling Xigmatek S1283 Hard Drives GSkill Phoenix Pro 120GB SSD Internet Speed T1