When setting up a computer, especially a Family computer – you may want to block application installs if non admin or similar. Now looking online this is possible if the application is installed via the windows installer -( gpedit.msc) see link to use: http://www.thewindowsclub.com/how-to-prevent-users-from-installing-programs-in-windows-7
But for applications like Chrome & Mozilla Firefox and many others they do not need access to the windows installer to be installed.
But what you can now do in the latest version of Windows 10 is to set up an admin account and enable ‘Allow Apps from the Windows Store Only’ See this guide on how to enable it : https://www.zdnet.com/article/windows-10-to-permit-block-on-apps-installing-if-theyre-not-from-microsoft-store/
Now when you log into the user account they can only install apps from the windows store. So we are almost there. Finally what we need todo is block the windows store : https://docs.microsoft.com/en-us/windows/configuration/stop-employees-from-using-microsoft-store#a-href-idblock-store-mdmablock-microsoft-store-using-management-tool
Now the computer should be sufficiently locked down to not have random applications installed by family users.