If you are getting notifications from ValidNetBoost, then your Mac is infected with adware. ValidNetBoost is adware for Mac.
ValidNetBoost changes setting in your Mac. First, ValidNetBoost installs a browser extension in your browser. Then, after ValidNetBoost hijacks your browser, it modifies settings in the browser. For example, it changes the default home page, modifies search results, and displays unwanted pop-ups in your browser.