Easy tips on how to childproof your PC
Parental controls can filter the web, blocking inadvertent access to inappropriate websites. There are a variety of ways to do this, from configuring network-wide parental controls on your router to using the parental controls built into Windows or third-party software.
Web filtering is best used to restrict the web for young children, preventing them from accidentally wandering into the seedier corners of the Internet. Teenagers are adept at finding their ways around parental controls if they want to.
http://www.howtogeek.com/167545/4-ways-to-set-up-parental-controls-on-your-home-network