Answer:
The problem usually results from shared IRQs (interrupt request lines) between sound and video hardware. Although modern PCs allow for IRQ sharing, multimedia video and audio data is very time-sensitive, so when you installed a second video adapter on a PCI slot, you probably wound up sharing an IRQ with your audio device. The secondary video data typically overwhelms the audio data, resulting in sound corruption.
You can try moving the sound card to another PCI slot, effectively changing its IRQ assignment. Alternately, if the sound is integrated onto your PC’s motherboard, try changing the audio IRQ manually through the Device Manager. In addition, you can shuffle the secondary video card to another PCI slot to find a better IRQ assignment. Check the sound card’s documentation or manufacturer’s Web site for specific assistance in changing IRQ assignments.
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