My DVD drive installed Windows 8 and can also boot from DVD, but Windows 8 does not recognize the drive after the operating system is loaded. If I boot with the Windows 8 DVD in the drive, ignore the option to boot from the CD or DVD, when the OS loads, the drive is recognized and I can use it for that session. If I reboot without the DVD in the drive, it is gone again. solution: 1. Run Command Prompt as an Administrator. Type cmd in Windows 8 modern UI and press cltr+shift+enter 2. Type following and say enter reg.exe add "HKLM\System\CurrentControlSet\Services\atapi\Controller0" /f /v EnumDevice1 /t REG_DWORD /d 0x00000001 3. Reboot the system