Windows XP: Hardware Interrupts consumes >50% CPU, hogging system
Goto: Right click My Computer-->Properties-->Hardware-->Device Manager that would display all of the devices installed in your system.
But we are interested in UNINSTALLED devices. Select Other Devices tree node and open it. If you see the uninstalled devices as mine, then right click and disable those devices. That worked for me.
S0, either install a valid driver or disable the device!