How to downgrade Qosmio Windows 8 to Windows 7 64bit

We have recently purchased Toshiba QOSMIO X75-A7295 with Windows 8 Home edition.
How do we downgrade the windows 8 Home edition to Window 7 enterprise 64 bit
I have also tried going into the BIOS to change the boot order but it does not boot from the Windows7 DVD but boots up windows8
How I install Windows 7 in Toshiba QOSMIO X75-A7295
.Do i need to change any other setting in BIOS.
How do we resolve this issue?
Thanks
JasimT

Thanks TomDexter and Macius
I really appreciate your detailed instructions.
I found the following details on the right side of BIOS Advanced Option while select the boot Mode
"Select the boot Mode
.(UEFI Boot )
Support to boot any UEFI-capable OS.
(CSM Boot )
Support to boot non UEFI-capable OS that expects a legacy BIOS interface. This item does not revert back to its default value by Load Setup Defaults Action ".
I need to clarify this .Now we are planning to install Windows 7 Enterprise SP1 . If I select CSM boot on BIOS.. In future we may need to upgrade this laptop to Windows 8.1 Pro . . Is it possible to change the boot mode CMS boot to UEFI Boot on Futur .
Please inform me .It can or cannot ?
Can I go ahead with installation of Windows 7 Enterprise SP1 on this laptop Toshiba Qosmio X75-A7295 now
Many thanks and regards
Jasim.
Message was edited by: jasim.tp

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