NT4’s CHKDSK/F WON’T RUN

NT4 w/service pack 6a. I engaged CHKDSK/F by clicking Properties \ Tools \ Check for errors on drive c:, then restarted the PC. On restart it goes right on to my login and doesn’t run chkdsk. I get an error message on login reporting that chkdsk is scheduled to run and that I should run chkdsk /f. I have also executed this from the command prompt and restarted with same result.

How can I get it to run?