NsUpkeep | An extra layer of protection.
A small program that will impose DNS settings every 5 minutes to help children, sensitive and/or vulnerable users to have a safer online experience when used with a good filtering service. Works between all networks (home, school, work, tours, etc.) since it's local. Protects against unwanted DNS changes from malignant software.
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OpenDNS Family Shield, etc. are good services to protect against e.g. pornography, auction sites, social media and other unwanted web sites. OpenDNS allows you to configure your own settings and allow specific web sites via their free Home service.