I'm performing a fresh install of Win 10. So I'll be creating new accounts, with their old user names. Most of these accounts won't have admin rights, but will have their own passwords.
Bitlocker doesn't seem to recognize the password for my hard drives, but it does unlock my thumb drives for some reason.
That's ok, I should wipe and re-install the contents of those drives anyway, just to de-fragment them. Of course I backed up the drives to two different external drives before starting the Win 10 install.