Download the 4.3E 000*.app file from one of ModMii Classic's download pages along with my menuify mod. Put it on your sd card, put sd card in the wii, and then launch my menuify and install the 00.app file
When u say it's freezing, it's not when you're selecting or cycling through channels, is it? If so, one of your custom channels may have a bad banner, and uninstalling it will resolve the issue