The other option for complete safety is taking the original MC you booted up with out after the installer is loaded. It's not needed once it's running, assuming the installer is on a flash drive. Personally, I put all my ELF files on the flash drive in "\BOOT" and leave it in; that, along with using the DVD file for embedding, frees up enough space that I install Free MC Boot on all my memory cards, so it's not a big deal if one gets messed up.
Originally Posted by ps2dragon
To err is human. To really foul up requires a computer.