cominginsecond,
Its hard to give meaningful advice without knowing your setup and what OS are you running.
Sometimes its enough to disable all unnecessary devices in BIOS (serial ports, usb, onboard network, audio etc.) to free more IRQs, and have the system reassign your hardware.
Sometimes, in case of Windows 2000, you can't get control over IRQ assignment unless you disable ACPI. Technically you can do it without reinstalling, but that is a time bomb. Therefore you are facing reinstalling your system as "Standard PC".