The soundcard and video card should NOT share the same IRQ. The way to check is:
Open control panel, click on system, in the device manager click on computer. Usually by default it opens to show you the IRQ's.
If you find that the video card is sharing with anything, the simplest solution is to: uninstal whatever it is that is sharing with the vid card, and then move it to a different slot in the board. Reinstal it and then go back into control panel system and see if it has changed.
SKurj