Ok my daughters Acer laptop already has Windows 8.1 installed. It has a MBR disk. My USB Flash Drive won't boot from it but it does my my desktop so not the USB flash drive.The flash drive was created for UEFI or MBR boot using Rufus. I tried the tutorial in sevenforums to convert the Acer to GPT but it says the boot drive is in use and can't. I tried to boot to a Command Prompt but that gives me...
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