There are those natural steps you always take when you set a new machine up (either for yourself or for someone else): Install the OS, install any updates, remove vendor-provided crap-ware, install antivirus, etc. "Install ad blocker" has turned into one of those steps for me. I now do it without even thinking about it. If you have tried to browse the web without one recently, you know why you need to: the current ad-encumbered web browsing experience is totally ridiculous.