Lenovo Yoga SSD based. No integrated CD/DVD. 16 GB memory, Intel i5 or i7 (don't remember). System will not boot. Error is a xc00000a2. System fails to "fix" issue. Have gone to "advanced options" and am attempting to get to a Command Prompt which shows "Owner" in the owner block. Clicking OK takes me to a PW screen which we do no have or know. As far as I know, this password has never been set. Is there a way around this PW or another technique for using a command prompt to do SFC or dskchk or several of the other options to find the likely corrupted driver or registry entry or damaged system file? I have not tried a system reload since I would prefer to preserve installed programs.