How to change IRQ of my device under Win2K/WinXP
For Windows 2000 and XP, you can not manually change the IRQ number. In Windows XP, Device Manager may list some or all of the devices on your ACPI motherboard as using the same IRQ (IRQ 9). (To view the list of resources, click either Resources by type or Resources by connection on the View menu). No option is available to change the IRQ setting.
Note that Windows 2000 and XP cannot rebalance resources in the same way that Microsoft Windows 98 does. After PCI resources are set, they generally cannot be changed.
The only way to change the IRQ assignment is move the device to different slots