How to Enable Legacy Advanced Boot Menu

To enable legacy advanced boot menu in Windows 8, step-by-step instructions given below must be followed:

1. Restart the Windows 8 computer.
2. Enter into the BIOS setup and configure the system to boot from CD/DVD Drive.
3. Save the modified settings in BIOS and reboot the computer.
4. Insert Microsoft Windows 8 bootable installation DVD into the optical media drive (CD/DVD Drive).
5. When prompted to Press any key to boot from CD or DVD, press any key to boot the computer from DVD support.
6. On the displayed Windows Setup box, click Next.
7. On the next page, click Repair your computer.
8. On Choose an option screen, click Troubleshoot.
9. On Troubleshoot screen, click Advanced options.
10. On Advanced options screen, click Command Prompt.
11. On the opened command prompt window, type C: and press Enter.
12. On C: prompt, type BCDEDIT /SET {DEFAULT} BOOTMENUPOLICY LEGACY command, and press Enter to enable legacy advanced boot menu.
13. Once the command executed successfully, type EXIT command to close the command prompt window.
14. Back on the Choose an option screen, click Continue to restart Windows 8 computer.
15. Eject Windows 8 installation DVD from the optical media drive when done.

Another method: Open a command prompt and run msconfig.  Then on the boot tab check the box for safe mode.