Yet when I log into my Gmail account, my PC acquires about 200 to 300 web trackers (a type of software that monitors your online activity) that I have to remove using CCleaner. If I log into Facebook, I get another 300 to 400 trackers. If I spend a couple of hours online, I can accumulate 20,000 or more trackers, which is far more than my old Windows 7 PC gets.

Why does Windows 10 attract more tracking software, and what can I do to maintain my privacy?

— Cliff Grulke, Minneapolis

A: There are several reasons that your Windows 10 PC is overrun by web trackers, bits of software code that follow you online to help marketers learn more about you. Here are a few:

• Web trackers make money. Nearly all commercial websites use them to create an elaborate profile of your tastes and habits, a profile that the websites can use themselves or sell to others.

Your online movements are tracked by cookies (bits of code left in your web browser), Google and Facebook tracker software (that follows you even when you aren’t on their websites), session recorders (that record everything you do on a website), key-loggers (that record what you type into text boxes on a website, even if you don’t submit anything), beacons (invisible objects in a web page that record how many times you viewed that page) and “fingerprinting” (a record of the technical details of your computer that can be used to identify you.)

• While privacy advocates are aware of web trackers, most people aren’t. As a result, web tracking keeps expanding. A recent study showed that 87% of the most popular websites now track your movements, whether you sign in to the website or not (see tinyurl.com/yyy5qyas). (View the web trackers on any website at tinyurl.com/y2em59e6).

• Windows 10 may indeed attract more web tracker software, because it collects more personal information about you than earlier versions of Windows did. Microsoft shares some of that information…