Peanut Butter PC is used by parents, grandparents, schools, and daycare centers. Peanut Butter PC lowers the barriers to learning by creating a straight-forward, kid-friendly interface for your PC. Adults and children can learn how to use Peanut Butter PC quickly and easily without any training. Make Any PC Kid-Friendly. Using this application, kids over 3 years old can enjoy the benefits of a PC while your files are kept safe.