Whenever i try to run windows' disk defragmenter or analyze my hard disk with it i get an error message stating "Disk Defragmenter has detected that Chdisk is scheduled to runon the volumje (C:). Please run Chkdsk /F. Whenever i try to run Chkdsk /F from the run command it says that Chkdsk cannot be run because the volume is being used by another process and asks me if i want to schedule it to run the next time the system restarts. If iselect yes and reboot my computer nothing happens. and defragment still wont work. What can i do?