Hi:
A clean install of Win10 is likely the best & safest way out (even though the window for a *free* upgrade has recently closed; legal Win 10/11 licenses are available from reputable sources).
BUT, it's certainly 100% your choice to continue with 8.1.
Just to manage expectations for you & for anyone who might casually read this topic:
Running an obsolete, unpatched OS carries both performance problems (e.g., lack of drivers for devices, peripherals & accessories) *and* security vulnerabilities created by >5 years without patching exploits. And, over time, you'll encounter fewer & fewer 3rd-party games, software applications, browsers and websites that support 8.1.
If you use this computer for *any* online activity, you'll be increasingly susceptible to data loss, identity theft or other catastrophe.
And then there's just the age of your computer. If it's a laptop older than 5-6 years under moderate-heavy use, the hardware *may* be approaching its end of life.
So, it's IMPERATIVE to mitigate these risks by making frequent system image and driver backups. And it's even more critical to backup all your data (files, folders, documents, photos, emails, etc) to external USB hard drives and/or cloud services. Doing so increases the chance of at least partial recovery from a catastrophe.
Having said all that, as just another home user, I understand the reluctance to move on from a Windows version with which you are comfortable. And it's certainly reasonable to try the tutorial @FreeBooter provided. Perhaps other helpers will have additional suggestions.
Whatever path you choose, I respectfully urge you to backup your stuff often, to minimize risk of data loss.
I hope you successfully resolve your current issues with OS corruption.
Cheers
PS This is a good time of year to find deep discounts & deals on new computers. Experts here can assist with selecting a suitable device.
PPS FWIW all the issues you describe with your Win10 computer can be easily resolved - but that's a separate topic.
Edited by MoxieMomma, 25 November 2023 - 08:19 AM.