I have scheduled a disk check on my C drive. It can't check the disk immediately, because it is in use, so it schedules the disk check for the next reboot. However, when I dutifully reboot, the disk check doesn't happen.
I found some instructions telling me to run
msconfig and force a reboot in Safe Mode. When I did this (and scheduled another disk check), I got the following message:
Disk checking has been cancelled.
How can I force the disk check to actually, you know, check?