Some of us who lived in the dim past days of OS/2 and limited support. You just make your own i suppose. A great variety of programs are removed by hand, especially if the system is not pre-emptively single-tasking in just the way ye want. So you fire up the range of utilities needed to do things.
Until recently, I used Windows 2000, but have since moved on to Windows 7 Ultimate. They started putting on this 'free upgrade to windows 10' on Windows 7. Kind of like how websites offer you free toolbars for your web browser that pins your computer in. I suppose it's one thing if your Browser updates, cause you can dump it overboard, it's different if your OS does.
So you can hand-remove it. The trouble is that the programs are locked, and run on the user System authority of 'TrustedInstaller' So if you don't have a neat utility that can wrangle the trustedinstaller permsisions, it's pretty hard. Someone cobbled a ' run as trusted installer' program, which copies the token of TI and runs your proggie on that token. Ok. Then you can hunt down the directory and trim the files (ie you can't delete them even if you're running as administrator or system). Needless to say GWX appeared about five or six times.
Being for the benefit of users who pay by the megabyte upload, Microsoft provided a 'background' service which hammers the hard drive for a good few minutes. You can't stop that outside of running as TI either. You can't even read the strings in the binary until you do it as TI. "We're just poking around your hard disk and seeing what sort of stuff you have".
It is of course, spaghetti ini files. Microsoft tried it in the Win2k resource kit (which i looked at at this time), which uses a local ini file, bounces to a CLSID back to a DLL in the system32 directory, back to a registry for more settings, and bounce back to an INI file in the reskit directory. I wanted to add the support kit to this stuff. It worked, sort of.
So "TrustedInstaller" seems to run at a level hitherto reserved for viruses. Even the clever folk would not have the wherewithall to cope with TI without serious hacking. It is little wonder that people use GWXCP and Never10. Vigilance is the price of democracy.