  Please watch Dell video in the link below, hopefully it will be a help to you:  
Hi Team, I have recently purchased a Dell Inspiron 13 5378 2-in-1 model laptop running with Microsoft Windows 10 Home OS and from the moment it has been started, I have been observing extremely slow performance issue being caused by 100% disk usage showing in "Task Manager". There isn't anything being installed on the system yet, and still its taking ages to open any utility window (task manager, system properties etc.) with really poor performance. I am continuously observing 100% Disk usage without even running anything. This doesn't seems to be an healthy scenario. I am already done through diagnostics test rub and clean boot, however nothing has helped me.Kindly assist as this laptop is completely unusable for me. Thanks,Saurabh
Inspiron 13 5378 2-in-1, 100% disk usage, Windows 10