When you say you installed a new sound card, did you remove another or was it onboard? If it was onboard, have you disabled the old one(preferably in the bios) or selected the new card as the primary audio device?
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Desktop * Athlon X2 4200 | 2G RAM | 160G HD | 7600GT
Laptop1 * C2D T5550 | 3G RAM | 120G HD | Intel x3100
Laptop2 * C2D T5250 | 2G RAM | 160G HD | Intel x3100
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