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Try right clicking computer in task bar then click manage/ device manager sound devices and see if you have any yellow asterx by any conponents if so try ckicking it and update driver. You can also go to the leadtek manufacutrers site and see if they have any updated drivers.
System Manufacturer/Model Number Self Built OS Windows 7 ultimate 64 bit / XP Home sp3 CPU intel Core 2 Duo E8400 3.0ghz Motherboard Asus P5ND bios 1401 Memory 8 gigs 1066 OCZ Fata1ty Graphics Card EVGA GTX 580 Call of Duty Black Ops Edition Sound Card Creative Soundblaster Audigy 2zs Monitor(s) Displays Asus 24in LCD's 2MS X2 Screen Resolution 1920x1080p @60Hz
Keyboard Logitech Bluetooth Wireless MX5000 Mouse Logitech Bluetooth Wireless MX1000 PSU OCZ 700W GameXtreme Case NZXT Apollo Cooling Corsair H50 CPU/120mm x3 /60mm x2 /Corsair Dominator Ram Hard Drives WD Caviar 500 Black/ WD Caviar 200 Blue Internet Speed Download 19.83 Upload 0.97 Other Info Logitech Z2300 Speakers/ Bose Noise Cancelling Headphones/Avermedia PCI-e Hybrid TV Bravo/Epson NX415 all in one/ 4 Port Powered USB Hub/ LG 10x Bluray Burner /TSST Corp DVDRW External