i think the first problem could have been solved with just holding down B when pressing + to install priiloader,
did you already check if it is present on your wii?, hold down reset when powering on. If not try to run the priiloader installer again and then do so.
if it freezes now also, do the below before that.
to the blackscreen stuff/freezes.
Follow this guide. If still no luck after that, follow the HBC apps section of this guide.