Might be a easier way.To disable PCI bus IRQ steering, follow these steps: 1.Click Start, point to Settings, click Control Panel, and then double-click System.
2.Click the Device Manager tab.
3.Double-click the System Devices branch.
4.Double-click PCI Bus, and then click the IRQ Steering tab.
5.Click to clear the Use IRQ Steering check box, click OK, and then click OK again.
6.When you are prompted to restart your computer, click Yes.
If you click No instead of Yes when you are prompted to restart your computer, the changes are not applied.http://support.microsoft.com/kb/182628