Installed Windows 8.1 Preview and Windows won't start

nonprossed

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Installed Windows 8.1 Preview and after reboot Windows won't start. Get screens saying "Preparing Automatic Repair," then "Diagnosing Your PC," and then a screen titled "Automatic Repair" which tells me my PC did not start correctly and gives me the option of pressing "Restart" or "Advanced Options." But to access the Advanced Options I need the Administrator password which, for the life of me, I can't remember. I used another computer to reset my Microsoft password online, but it doesn't take that password either. Help!! I don't know what to do at this point.
 

My Computer

System One

  • OS
    Windows 8
    Computer type
    Laptop
    System Manufacturer/Model
    Toshiba
Restore the backup image you made before you upgraded to 8.1 and try again?
 

My Computer

System One

  • OS
    Windows 10 Pro X64
    Computer type
    PC/Desktop
    System Manufacturer/Model
    Lenovo IdeaCenter K450
    CPU
    Intel Quad Core i7-4770 @ 3.4Ghz
    Motherboard
    Lenovo
    Memory
    16.0GB PC3-12800 DDR3 SDRAM 1600 MHz
    Graphics Card(s)
    Intel Integrated HD Graphics
    Sound Card
    Realtek HD Audio
    Monitor(s) Displays
    HP h2207
    Screen Resolution
    1680x1050@59Hz
    Hard Drives
    250GB Samsung EVO SATA-3 SSD;
    2TB Seagate ST2000DM001 SATA-2;
    1.5TB Seagate ST3150041AS SATA
    PSU
    500W
    Keyboard
    Wired USB
    Mouse
    Wired USB
    Internet Speed
    3GB Up, 30GB Down
    Browser
    SeaMonkey
    Antivirus
    Windows Defender; MBAM Pro
    Other Info
    UEFI/GPT
    PLDS DVD-RW DH16AERSH
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