Hello,
A nice summary of what the difference between a current and clean version of Windows is:
A clean install of Windows 10 helps declutter the computer, frees up space, and eliminates performance and speed issues. It also helps remove viruses, Trojans, malware and bloatware from the system, and eliminates system problems like blue screen errors.
Cited from https://www.techtarget.com/searchitchannel/definition/clean-install
You can download Windows 10 at:
Create Windows 10 installation media
https://www.microsoft.com/en-ca/software-download/windows10
If this is helpful please accept answer.