In the last few days my 450 has started having disk activity constantly. Every time I leave it sitting for a few minutes, it starts working. I've shut down all tasks in the task manager except for explorer and it still does it. I disconnected it from RoadRunner, and it still does it. How can I find out what is causing this? There doesn't seem to be a virus on the machine,,, free disk space remains the same.. I tried to do a scan disk, but was unsuccessful, it kept stopping saying it couldn't continue due to disk activity.