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I've had this issue a while ago on my Alienware m17x R4 with 7970m and windows 7 Ultimate x64 and I've been trying to fix this since, but I've found a solution :DIt's probably more simple then you thought it would be :PBasically, what you do is you switch to iGPU Intel HD4000 first (FN+F7),then you have to install this audio driver (A01, 4/30/12, Creative Labs CT9570, Audio_Creative_W74_5NJ7K_A01-Setup_ZPE.exe), 6.0.100.2033 driver from their website,Switch back into dGPU again,there you go :DHope this helps