How to Block Craigslist
The Craigslist.org classified website is a useful service that lets anyone post a free advertisement under any number of topics. Craigslist sometimes serves as a meeting place or business exchange site as well. Craigslist offers no guarantee as to the authenticity of the user or transaction. If you are concerned about the safety of users in your household, you can block access to Craigslist in the Windows "hosts" file.
Open the Start menu and type "notepad."
Right-click "Notepad" from the "Programs" result list, then click "Run as administrator" from the menu.
Supply your administrator credentials if prompted.
Click "Ctrl"+"O" to open an "Open" dialog window.
Type "%windir%\System32\drivers\etc\hosts" and press "Enter" in the "File name" bar at the bottom of the window.
Type the following into a new line at the bottom of the document:127.0.0.1 craigslist.org127.0.0.1 www.craigslist.org
Click "File," then "Save." Whenever your computer attempts to look up the Internet Protocol address of "craigslist.org" or "www.craigslist.org" it will be blocked and the request sent back to your computer.