How do I create a thumb drive to boot from?

[TheHubby]

I'm looking not to install Windows, but just to boot my system from a thumb drive. For some reason, updating the BIOS for my motherboard screwed with my RAID 0 drive. I can now either boot normally but have only my C: and D: drives, or I can turn on VMD and the RAID drive shows in the drive list, but it no longer sees the C: and D; drive, so BSODs because Windows isn't on my E: drive. I need to boot up with the E: drive active so I can pull all the files off it to an external drive I bought, then set the RAID drive up again.TLDR: I need to boot from a USB, not install Windows.

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