IRQ Conflicts

I’m running Win XP Pro with a PIII 1.2, 768 RAM,
GeForce2 MX400 64MB, NIC, and sound card. My problem is this: the video, sound, and network
card are all sharing IRQ 9 along with two other devices which normally take 9. I can’t manually change thesettings in Device Manager because the manual setting check box is greyed out. I want to change the video card to 11, sound card to 5, and NIC to 10. Any Ideas?