How can you change the IRQ settings in Windows 7

I have a conflict on a toshiba laptop, the synaptics touchpad has a issue being on IRQ12 set by Windows 7. When I want to change the IRQ setting under Device Manager, the Resource tab will not let me change any settings! Any help would be appreciated. Has anyone else had this problem? I do recall sometime back in a training class that there was a trick to changing resource settings?
Thanks