I too have the same problem !
This is very bad from Microsoft !
I found some information regarding this issue .
Firstly, according to wikipedia (https://en.wikipedia.org/wiki/Windows\_10) windows 10 was released on 29th July, 2015.
On the same day a post on Microsoft Support ( https://support.microsoft.com/en-us/help/3083595/task-manager-might-show-100-disk-utilization-on-windows-10-devices-wit)
This issue isnt new to Microsoft!
Since then, there are a number of posts about this issue on various platforms from 2015 till now !
Besides many related posts here, there are many more on the web.
https://social.technet.microsoft.com/Forums/en-US/8db2229d-2066-4a2a-b7a0-3f4fac9e3deb/windows-10-64bit-100-disk-usage?forum=win10itprohardware
https://tunecomp.net/100-disk-usage-windows-10-how-to-fix/
https://www.easeus.com/partition-manager-software/fix-windows-10-100-disk-usage-in-task-manager.html
https://www.online-tech-tips.com/windows-10/troubleshoot-100-disk-usage-windows-10/
https://windowsreport.com/windows-10-anniversary-update-100-disk-usage/
https://www.drivereasy.com/knowledge/100-disk-usage-windows-10-fixed/
https://www.partitionwizard.com/partitionmagic/100-disk-usage-windows-10.html
https://www.makeuseof.com/tag/4-tips-fix-100-disk-usage-improve-windows-performance/
http://www.tomshardware.co.uk/forum/id-3579010/100-disk-usage-drving-nuts.html
https://fossbytes.com/fix-100-disk-usage-windows-10/
This issue seems so common and unsolved for most ( maybe all ) . Once you get this issue, it appears there is no way out !
I am using my system with dual boot, and I face no issue while I use my other OS.
If Microsoft does not not want to look into these issues and let users suffer then Microsoft should realize there are alternatives for people.
Even if this issue is not related to windows, simple fact that there are many questions posted to them should make them act for us !
Microsoft could make a analysis on these issues and publish some information. It will help a lot ! I have been struck around this issue for more than 2 weeks now and I sometime feel, it is not worth the effort!
No matter how many features you give, if I am unable to use my computer then what is the whole point ?? Practically, my computer is useless with 100% disk usage and sometime I think of #UninstallWindows10
Just because you dont know, doesnt mean nothing is happening ! Act if you care, before it is too late!