Sure: Linux.
But it's not for everybody... I personally like it and use it (in addition to Win7 and Win10 and MacOS and...). But if you've only used Windows in the past, switching to Linux is a "learning experience".
Then again, switching from Win7 to Win10 is even more of a "learning experience", in most people's opinion (including mine).
One computer is running Windows 7 and another one is running Windows Vista (on a Toshiba laptop) - I tried to upgrade it to W7 but it wouldn’t take it. My travel PC is a notebook running W7 and I like it but if MS is going to get nasty I don’t know what I’ll do.
It used to be that using Linux required the user to learn a lot of tricks and jump thru some hoops to get it to work like they wanted. Still does as far as getting MS fonts and proprietary network drivers, but those are simple downloads.
Windows now requires more work arounds than Linux and it isn’t worth the trouble.
>> Is there anything out there that could replace MS10 on current PC’s?<<
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“Sure: Linux.”
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Right now I’m using Linux - Lubuntu 16.04 themed with Win XP desktop/startbar & Win 10 icons. I have it dual booting with Win7 on the other drive.
Running Linux isn’t hard - a person just has to get used to the change from Windows. One change that’s great is the operating system and software are free. There are a lot of version to try out. And there are versions of Linux designed specifically for people coming over from Windows. (Versions are called “distros” in Linux-speak.)
The curious can check out different distros here:
https://distrowatch.com
I’ll have to study this Windows issue a bit more, might be dumping Windows before I planned! Ain’t gonna go with Win10.