Peace actually works. I actually tried it a couple of days before, but it didn't work. I don't know why. But now, for some reason, it does. As for APO, I've opened the Configurator several times, but the only thing it messaged me was the aforementioned registry error. After that, it didn't do anything else, but the effects are still not working. I'll probably just use Peace for now. Thank you so much for your help.
Equalizer APO is not working anymore.