Im Restrict Friends How Do I Restrict Access To Certain Sites From A Computer?

How do i restrict access to certain sites from a computer? - im restrict friends

In really try to help a friend here, she is playing a problem with your B / F, all their money. He refuses to be a problem and managed to infiltrate into the computer at every opportunity, so I thought that would be the blocking of websites is a good idea, but I'm not whistling Team HELP!

Can this even be done from Windows, or do we need a prog to do this? Also the restrictions can be protected by a password, so that not only change returns and?