HDD runs continuously at 100% usage
My CPU usage shows 100% usage with nothing running. The hard drive is 61% free. I've checked the Task manager and closed unnecessary programs such as iTunes Helper, HP products, etc. I've cleaned up Temporary Internet files, ran Defrag... Symantec found nothing, so I installed Ad-Aware and SpyBot and ran those. They found and removed a few items but the CPU Usage still runs at 100%. Could this be an OS corruption or is there something else I'm missing?