Plus there are also those users who go to the internet and follow some online "hack", "fix", "enhancement", "configuration secret", "gamer tool", etc.for whatever reasons and edit the registry, install startup apps and utilities that do who really knows what.
And/or mess up the procedure along the way.....
All too easy to misread or misundertand some posted "how to" video or tutorial. If the video or tutorial is even correct, valid, or applicable to begin with. Few people look for validation and just ignore any risks/benefits consideration.
Willing to do anything to gain a few fps's and win whatever game is in vogue at the time.
Then a real update of any sort comes along and all falls apart when things are not as required or expected. Things that should never have been changed to begin with.
Lots to be said for "if it ain't broke, don't fix it". At many levels.