Some days ago I had an issue on a Windows 10 machine that had a high I/O on disk since many days. The problem came from the Windows Update service, so because rebooting do not solved the problem :-) I tried to reset the Windows Update service.
First stop these services:
net stop bits net stop wuauserv net stop appidsvc net stop cryptsvc
Then run this command:
Del "%ALLUSERSPROFILE%\Application Data\Microsoft\Network\Downloader\qmgr*.dat"
Last step is restarting the services:
net start bits net start wuauserv net start appidsvc net start cryptsvc
Fortunately the problem was solved.