Windows 8 repair with install disc

A client wants to repair their Windows 8 desktop and have their installation disc.  The computer will not boot into Windows or give them the F8 menu.  What steps can we take to do this?

Also, he threw away his product key.  Is there a way to retrieve it without installing?

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What machine is this? Laptop/Desktop.
Try F2 or Del to enter BIOS and set boot to CDROM.
or F12/F11/F10
you have to boot into bios
this document explains all options for HP laptops,
if you have a different brand, you may have to use other keys to enter the bios
HuaMin ChenProblem resolverCommented:
You can join MSDN operating system subscription, to have the relevant Windows 8.1 version Registration keys.
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If it is a PC that was bought with Windows 8.x pre-installed, it will have an UEFI BIOS and Secureboot enabled. You may have to disable Secureboot to be able to boot from the DVD. Besides that, the Windows product key is embedded in the BIOS, and as long as he installs the same version of Windows 8 (Windows 8 or pro etc) that originally was installed you won't need the key and it will read it from there and automatically activate.

Besides that, such PC's normally have a recovery partition from which you can do a factory reset of the OS. Just check the manual or on the manufacturer's site on how to use that .
David Johnson, CD, MVPOwnerCommented:
A msdn subscription which he doesn't have would cost more than buying another copy of the OS,

boot from the install dvd, and select repair start up
epichero22Author Commented:
This is a custom built PC.  The motherboard is a newer model MSI.

I'll try having him use repair startup, but are there specific steps he can follow?  I have to walk him through this over the telephone.
here is what you need :      

for booting into the Bios , see my link above

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@nobus: his system is not startable, so that link is not applicable.
@epichero22: it does not boot - what does it do instead?
McKnife -thats why i posted the link to boot to bios ....
i hope all is well now, epichero22?
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