When I right click my C drive and go to properties then to tools and do an error check, it tells me it has to be in control of the files so it schedules it on the next reboot. When the reboot occurs, I get the scandisk\chkdsk screen but it then says it has been cancelled. Rebooting to a command prompt in safe mode then runing chkdsk /f will not run and it tells me some process has the drive. After much searching, I have uninstalled Acronis True Image, Zone Alarm Pro, and AVG7 anti virus. Still I cannot check for errors. How do I determine what has control of my hard drive that prevents the error checking to proceed?