Voice sound in game cutscenes is gone? any suggestions

I recently noticed in Mafia 2 demo (cutscene) and Resident Evil 5 benchmark test (cutscene) , Batman Arkaham Asylum (gameplay), there is sound except the voice dialogue is gone. Any suggestions on how I can fix this? i have a evga p55 ftw motherboard (audio ports are built in to the motherboard, no seperate / custom sound card) thanks for any help

current pc specs below

Motherboard: EVGA P55 FTW
Processor: Intel Core i5 760 2.8GHz LGA 1156 Quad-Core Processor (8MB L3 Cache)
CPU Cooler: Magahalems Rev.B
Power Supply: 750 Watt Corsair PSU
Graphics Card: Single 1536MB GDDR5 Nvidia GTX 480
Memory: 8GB Corsair XMS3 DDR3 1333Mhz (4x 2GB) Dual Channel Memory
Hard Drive One: 80GB Intel X25-M - Solid State Drive
Hard Drive Two: 1.5TB- SATA-II, 3Gb/s, 7,200RPM, 32MB Cache HDD
Alienware OptX AW2310 3D monitor
Nividia 3d vision

Check your audio settings or sound drivers.They are probably messed up or there is something wrong with the sound channels

Check your audio settings or sound drivers.They are probably messed up or there is something wrong with the sound channels

capitalism25

audio settings in the games look fine. drivers appear to be up to date. how would i know if something is messed up with the sound channels?

Ive seen this problem before but remedies are quite rare.Usually the problem is setting the speaker config wrong (ex 2.0 audio set to 2.1 in game) as well as setting the audio settings in windows wrong.There are also situations wherein you check your CFG files in my documents or game folders, sometimes its also wrong (I also had this problem with Bad Company II and i just had to change settings in the cfg files in my documents).

Ive seen this problem before but remedies are quite rare.Usually the problem is setting the speaker config wrong (ex 2.0 audio set to 2.1 in game) as well as setting the audio settings in windows wrong.There are also situations wherein you check your CFG files in my documents or game folders, sometimes its also wrong (I also had this problem with Bad Company II and i just had to change settings in the cfg files in my documents).

capitalism25

what is weird is that it seems to be effecting every game i have