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#11
Alright, I managed to get my computer to boot from the stick and click "Repair my PC" in the lower left corner of the installation window. The after that, a version of the advanced startup menu came up, which I presume ran over the USB stick windows. I clicked on startup repair there, which after 45 minutes of "attempting repairs" wasn't able to fix the problem. Do you know of anything else I should try in that advanced startup menu?
Thanks a lot for your help so far!