So, being foolish old me, I tried to use os-uninstaller to remove my Windows installation and make way for Arch Linux.
Unfortunately, now nothing on this computer boots, and I cannot even boot from a USB! The "USB HDD" option has completely disappeared from the BIOS and has been replaced by "ubuntu".
I can't seem to boot from anything, and was looking for a way to restore the ability to boot from USB again.
*Update - There was a recovery utility that has let me boot into Windows, but that still hasn't solved the problem of being unable to boot from USB.
If it helps, the computer is a Samsung NP540U3C and the BIOS is Phoenix Securecore Tiano Setup.
Also, why would ubuntu remove the ability to boot from USB in the first place? Very perplexed over here.