"Not a COM32R image" error when trying to install from a USB key

A quick/dirty way to solve this issue is to press TAB, the computer will provide a text menu with your options, i.e. live live-install test etc.

Now just type the option you want, i.e. live Enter. This will boot it as a Live CD [sic], and then continue installation from there.

I just ran into the exact same problem. I followed the answer posted by 'Lelouch Lamperouge' and can make one small change, I did not have the 'live' command or option to boot from, but instead where it said boot: I typed install and hit enter

This started the installer normally and I did not have any further problems.

I'm not sure why this comes up, I can imagine it is a problem with how the bootloader is installed (but I could be wrong). Either way this worked for me. Good Luck!