before installing win8.1 where you running win7 on an MBR disk with legacy boot in uefi/bios and did you change it to UEFI or secure boot in the uefi/bios and is the disk now a GPT disk?
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before installing win8.1 where you running win7 on an MBR disk with legacy boot in uefi/bios and did you change it to UEFI or secure boot in the uefi/bios and is the disk now a GPT disk?