chkdsk found inconsistencies on my system partition, but only runs in read-only mode because it can't lock the partition exclusively (yes, even during reboot).
I want to run the Startup Command Prompt (new version of Recovery Console) that runs from the BitLocker helper partition, then the system partition won't be in use and
chkdsk should be able to get its exclusive lock. Plenty of instructions around the web with instructions on how to do this, e.g.
All of these indicate that the "Advanced" button pulls up a menu offering an option of "Command Prompt". But on my system (Win8 Pro RTM 64-bit from MSDN, upgraded from Win7 Ultimate in-place) it doesn't.
What causes these options to be missing and can I get them back?