Was running XP Pro, no service packs. CPU began to spike when running any of a number of programs, running between 60% and 100% even though System Idle showed 99%. Suspected malware or bad drivers, tried fixing both. Nothing worked.
Made a fresh install of XP Pro, installed Service Pack 1a. Still showed CPU spiking to 20% even though Sys Idle at 99%. Discovered and downloaded Process Explorer which shows the problem to be Hardware Interrupts.
Could Hardware Interrupts have been the problem that was killing my computer earlier? What can I do to identify which piece of hardware is causing the interrupts? Once I identify the source of the interrupts can they be fixed or do I need to replace the part?
Thanks in advance for any support or suggestions!