This problem about, hardwares-drivers which use same IRQ port on same computer.It means, computer try to give answer some hardwares by some priority rules. Your sound card IRQ and some other hardware IRQ use same IRQ Port on your computer ( Generally sound card & wireless adapter use same IRQ Port on windows notebooks, IRQ Conflict)
Solution : You can try disable other hardware drivers on the Device Manager under Control Panel.
For example you can close, webcam, wireless adapter, lan adapter,and other hardwares that use usb ports etc. Try again, you ll see, it will be solved.
You can see which IRQ ports used by which hardware, under system info.
1-Start->Type System Information and check list and click system information
2-Under System Information->Hardware Resources->Conflicts-Sharing (for windows 7)
(Sorry about my english)