My disk usage is 100% all the time making it impossible to play games or do anything really. I had this problem previously on Windows 8.1 and recently upgraded to Windows 10 and still have the problem but it's worse now. I thought i had a virus so got avast pro and ran all sorts of tests and cleaned up my PC but nothing has worked!!
go to add remove and delete anything you don't recognise you could have something running in the background you don't know about , if you delete anything make sure you also delete any related start up entries or your pc will hang a lot looking for a program you no longer have.
also check your browsers for unwanted extensions and adds , they could be using resources .
open task manager processes , the top section , apps are the things that are running right now.
BTW... in start up entries I only have Realtek sound card and headphone driver set to run... my Kaspersky starts up at boot up without a msconfig entry
Have you got some updates downloading, or installing?
Is an update failing to install, perhaps, and your computer continuing to try to install it?
What is your theoretical disc size? How many restore points?
Full Disk usage can caused by many ways, and here is an article can help you to fix it: click here
Another first time poster with no feedback
