I have a Toshiba Satellite C850 - 1C1. It came pre-installed with Windows 8 64-bit and just like any other Windows 8 OEM product it does not have a product key I can use; or rather, the product key is embedded in the bios.
My installation of Windows 8 is corrupt and so is it's recovery partition. Because of that reset and refresh is of course also not available. The physical hard disk itself is alright as I've already tried installing Windows 7 in it and it worked fine.
What I did was clone the disk contents onto a spare disk and did a clean install of Windows 7. I did that because I could not find a solution and needed a personal computer I can use for work. Just in case I find a solution I can just clone it back.
I cannot find any free downloads for a recovery media nor can I recover the corrupt files. Unfortunately I also did not create a recovery disc when I first used it. It also didn't come with a recovery disc upon purchase.
So now the bottom line is I cannot think of another way but to repair the installation using a Windows 8 media or do a clean install of windows 8 from a bootable image burnt onto a disc or copied onto a usb device.
Take note that this is not a duplicate of the following questions simply because a product key is not available to me.