One day my apps just didn't show up in my taskbar. I've tried dragging and dropping icons to pin programs, but I get this

. When I open apps and minimize them, they don't appear in the taskbar and just disappear into oblivion and I have to use task manager to manually bring them up, which is infuriatingly annoying. I updated to Win 10, thinking it'd somehow solve the problem, but it still doesn't work. Help.