For most computer labs that serve visitors under the age of 18, or that just want to keep all the adult content from being viewed in your lab, it is best to have some sort of content filtering on the computers. Microsoft offers free content filtering with Windows 7 and Windows 8/8.1, which can be used by labs or individuals.
For networks that are peer-to-peer, the software is easy to set up. Before installing the software on a domain, make sure each filtered profile has been created on the computer. The best way of doing this is to log in once with each user name. Then log in as administrator and install the program.
Note that you should use the same log in profile for each computer. You will need a Windows Live, Hotmail, MSN, or some other Microsoft account to install.
Go here for instructions on how to set up Family Safety.