don't you have the hackmii installer inside hbc if you plug in the sd card with the softmodpack on it. you should really setup bootmii properly (get a nand backup) etc. /start from the beginning of the guide, stick to it, browse the thread ("seach thread" in the grey bar)/ask questions there.
if you see the .md5 files there really should be a md5summer.exe around. when you however can't find it: download.
edit: saw it isn't in the pack of chapter2. download from chapter1. boot.elf should show up in hbc if not drop it to \apps\hackmii\boot.elf