When I was using Windows around 2012, when I had a very low amount of computer experience, I would commonly wipe and reinstall Windows due to how often it got filled with crap.
Now I have a couple Windows installs that have been going strong for years. One of 'em has shady proprietary Chinese factory flashing tools on it, and a full development environment for TI graphing calculators. That was my old computer; I don't use either of those tools anymore so my new computer doesn't have them.
A non-expert trying to use Windows on the internet in three early 2000s had a near 100% chance of filling it with malware.