changing IRQ's in Windows XP

[illogical]

I'm trying to change the IRQ settings of my USB controller. It's conflicting with a PCI card I just installed. [img]/images/graemlins/frown.gif[/img]

Edit: The PCI card is a TV tuner. Everytime I plug something into the USB port, my picture starts freezing. Apparently, my USB controller and PCI card are sharing the same interrupt request, thus causing the conflict. Windows Xp won't allow me to change it for some reason [img]/images/graemlins/mad.gif[/img]