Help with Installing Linux Mint alongside Windows

If BitLocker was enabled before you disabled it, it might have left your USB in a weird state. Try deleting the TPM keys in your BIOS if you haven't already—that can often resolve boot issues. Resetting those to factory defaults and ensuring Secure Boot is off might also help fix your installation problems.

Did you check if you have a free partition available for Linux? If your USB drive isn't working, ensure that you're using a USB stick that’s fully functional. There are various tools available that can help you create a bootable USB, so trying another may help too! Also, renaming files can sometimes be a quick fix, as you've found out.

It sounds like you ran into a pretty common issue. When setting up Linux Mint, sometimes the USB drive can have problems becoming a recognized boot device, especially if you’re having conflicts with BitLocker or secure boot settings. Make sure your USB is fully set up as a bootable drive, and double-check that it’s recognized in the BIOS. If you're facing a specific error about mmx64.efi, this problem has been documented a lot online, so searching for that can give you more targeted solutions.

I had a similar problem before. Ensure that during the installation, your USB drive is the first boot option in your BIOS settings. Sometimes, it helps to have Windows and Linux on separate drives, but if you only have one, just make sure the installation process is allowed to overwrite anything conflicting. Have you tried formatting the USB drive again or using a different tool to create the bootable drive? That sometimes does the trick.