Trying to go from 32-bit to 64-bit Windows 8.1

empireoflight

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Apr 7, 2015
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I'm building a PC, and I didn't get an optical drive.
I bought a downloadable copy of 8.1 through my school.
I used an older PC (32 bit) to make the installer on a usb drive.
Now I'm realizing I can't get my new build to run anything but 32.
What can I do? I don't have access to a 64 bit machine, or else I'd re-do the installer process.
Please help; I can't seem to find any answers via search.