Keeping the software current Windows
Modern computers contains al lot of software. A fully updated fresh windows installation contains well over 50.000 files - and before it being “usable” with the most common applications, plugins, addons and extensions for the software you use on a daily basis, you’ve probably added so much more, that you’ve completely lost count of what’s been installed.
It’s a pretty bad situation in terms of security and software maintenance/updating.
WindowsUpdate has come part of the way.