My office machine (not my NTPC) HDD is continually working even when I am not doing anything on the PC. It drives me nuts. I have turned off (disabled) the Indexing Service and cannot see that the MS Office Index feature is installed let alone running. In looking at the Processes list in Task Manager it is a process called 'System Idle Process' which is eating up about 95% CPU usage all the time. No wonder this PC seems so slow now (It's an Intel P4 2.0GHz) I have Windows XP and would be most grateful for any suggestions to stop this permanent 'chattering' next to me. Thanks.