Password Protecting the Internet on Shared Computer

Working as an I.T. Assistant for a public business my boss wants me to start password protecting the internet on all staff computers. Recently, somebody in the public was able to access questionable material on my computer, due to it being located in the public, while I was away from work. My boss asked me to find a way to password protect the internet on all staff computers, for each staff member who shares a computer. The boss wants to be able to see who signed onto the Internet and what websites they accessed without requiring them to switch users on the computer. How can I go about doing this in Windows 10, what special programs can I use to do this?

Its not bomb proof but a proxy is a good way you can see what people are doing and set rules http://www.thewindowsclub.com/ccprox...ftware-windows

Thanks, I just finished installing it, and it was exactly what I was looking for. Thanks so much.