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To enable legacy advanced boot menu in Windows 8, instructions given below must be followed:
Restart the Windows 8 computer.
Enter into the BIOS setup and configure the system to boot from CD/DVD Drive.
Save the modified settings in BIOS and reboot the computer.
Insert Microsoft Windows 8 bootable installation DVD into the optical media drive (CD/DVD Drive).
When prompted to Press any key to boot from CD or DVD, press any key to boot the computer from DVD support.
On the displayed Windows Setup box, click Next.
On the next page, click Repair your computer.
On Choose an option screen, click Troubleshoot.
On Troubleshoot screen, click Advanced options.
On Advanced options screen, click Command Prompt.
On the opened command line interface (CLI), type C: and hit Enter.
On C: prompt, type BCDEDIT /SET {DEFAULT} BOOTMENUPOLICY LEGACYcommand, and press Enter to enable legacy advanced boot menu.
https://answers.microsoft.com/en-us/windows/forum/windows_8/windows-8-error-irqlnotlessorequal/3274451a-5d22-4c22-ac47-8cf9247ebbe2