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For months, I was able to dual boot Windows 7 and Windows 8 on my laptop. Both are on different partitions on the same hard drive. I primarily use Windows 8 and I almost never boot on 7, but it is there.

Yesterday, I decided to boot on Windows 7. As I was leading to the "Choose operating system screen" of Windows 8, I got to a blue error screen that said Windows 8 was unable to load. (Error code 0x0000225, missing winload.exe.) I tried refreshing via a bootable USB, but it failed. Thankfully I was able to boot to Windows 7. I switched the default OS to 7. At this point, whenever I boot, I get to choose between 7 or 8, in which 8 leads to the error screen.

I tried fixing the problem by recreating the BCD file, but afterwards, the computer doesn't recognize that I had a Windows 8 partition anymore (it doesn't let me choose between 7 or 8 on boot at all).

Is it possible to boot onto Windows 8 again? I have important files on that partition.

Extra Information: The partition that was Windows 8 now shows up on Disk Management as "Free Space".

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When you tried refreshing Win8 from usb, did you get an error code? –  Moses Aug 19 '13 at 19:08
    
Windows 7 was unable to boot or Windows 8 was unable to boot. You describe selecting Windows 7 then indicate Windows 8 gave you a BSOD. If the partition shows as free space that is a major problem. –  Ramhound Aug 19 '13 at 19:16
    
You say the Windows 8 partition shows up as free space. This pretty much guarantees that the Windows 8 partition was 'deleted', i.e. removed from the partition table. You should look into software that can recover a partition that was deleted. –  parashep Aug 20 '13 at 2:42

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