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Chkdsk Won't Run

A scheduled chkdsk /r does not run on reboot.

• HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\BootExecute
  Should contain:
  autocheck autochk *
• CMD: fsutil dirty query C:
  Should return 'not dirty'.
• Check for any third-party disk utilities such as Diskeeper, Partition Magic, etc. Try disabling their startups and services. Try scheduling chkdsk /r then reboot to safe mode.
• Check /windows/system32/autochk.exe. Take ownership of the file. Try replacing with a known good from same Windows version and SP.
• Try chkntfs /c c: -- see if it turns anything up or runs at all.
• Try running chkdsk /r from recovery console.