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DimonNT,
Попробуйте так - [FIX] Error “0xc000000f – The Boot Selection Failed Because A Required Device Is Inaccessible”

И так:

Please follow these methods. Method 1: Refer the following steps: a) Insert the installation DVD or USB and boot Windows 8 from it. b) In the ‘Windows setup’ page select the ‘language to install’, ‘Time and currency format’ and the ‘keyboard or input method’ and click on ‘next’. c) Click on ‘Repair your computer’ and select ‘Troubleshoot’. d) Click on ‘Advanced options’ and select ‘Automatic Repair’ and select the operating system. Method 2: I would suggest you to insert the Windows 8 installation media and then follow these instructions: a. Click on Repair your computer. b. Click on Troubleshoot and then select Advanced Options. c. Click on Command prompt and type the following commands and press Enter after each command: Bootrec /fixmbr Bootrec /fixboot Bootrec /rebuildbcd d. Restart the computer. e. Check if the issue persists.