Content-filtering software is designed to help control the content and resources users can access. This software can be applied to computers to prevent access to websites with objectionable content, including gambling and/or gaming. Some programs may even allow users to limit the amount of time spent accessing the internet.
There are many content-filtering and parental control products available on the internet on both a 'paid' and 'free' basis. An internet search will reveal a variety of providers, options and information on these tools. Try searching using keywords such as: "Content Filtering Software" "Parental Control" or "Internet Blocking".
Whether you choose a paid or free version of this software, do your research and find the tool that is right for you!