100 % disk usage and still nothing fixes

I have -

Dell Inspiron 5567

Intel CoreTM i7-7500U

RAM - 16 GB

 

When i bought my laptop, in starting days it's running quite well but after few days in task manager it shows disk usage 100% with or without any running application so I run my drivers update some of them are updated(i updated according to the order given by DELL on there website) but the disk usage remain 100%, after that i made my windows disc image via MICROSOFT TOOL(on my same computer which have problem and also it's genuine Windows 10) so after successfull disc image i deleted my entire disk data(to get fresh start) and after installation of windows 10, i again visited DELL DRIVER CENTRE to download DRIVERS and I have installed each and every drivers in order as recommend by

DELL SUPPORT

http://www.dell.com/support/article/in/en/indhs1/sln148687/how-to-reinstall-drivers-in-the-correct-order?lang=enand i made single restart after single installation of driver as it required by DRIVERS.

at last i updated every drivers and after that i checked for WINDOWS UPDATE and updated also

now my laptop have updated drivers and windows updated but when i run any software to install or browsing task manager shows 100% disk usage 

then i fully diagnose my laptop by DELL

and after scanning nothing error or issue found 

so i visited dell technical support and followed their instruction as given by their officials

https://www.youtube.com/watch?v=jiB6B55c77o

  

and yes my  AHCI driver is iaSTARA.sys  not storahci.sys , so no issue with AHCI driver 

now i made each and every possible way to get rid off from 100% disk usage