Ok I looked up your mobo if you ever need it-
Your MSI mobo and processor should be getting along with Mint.
I didn't see the BIOS mentioned on the specifications sheet.
Do you know if your have UEFI BIOS?
If so you may have to disable the secure boot.
Did you check the integrity of that iso file with md5sum before burning it to DVD?
If not the iso file could be corrupt.
I would only trust the iso directly from Linux Mint or where distrowatches main page takes you.
You should have automatic boot in 10 seconds after placing the DVD in the drive w/o pressing any keys.
I would try that
since you mentioned that using the arrow key presents that complaint about not being able to create the root directory.