Hello everyone.
I have good news for the SO many people struggling to fix the 100% hdd usage.
You see i've been a victim of that issue myself.
For the last two days i tried every so called solution that i read on the web. Even crazy stuff. Nothing worked. Nothing at all (especially the silly suggestions like the chrome and skype ones, i don't even have chrome installed).
I was so frustrated i was seriously considering buying a new pc! yes that frustrated.
As a last resort i opened a chat with Microsoft support.
I had little hope the support person would suggest anything effective but to my surprise it worked immediately (yeah, i know, if you are here, you've read that promise before, but THIS IS THE REAL DEAL!).
Enough talking. Here's what you should do:
open msconfig (simply type msconfig in the search field)
and go to the Boot tab.
There click the Advanced button.
You will see a checkbox with the text "number of processors". Check the box and make it 1.
To the right of that there is another checkbox that says maximum memory. Check that box too and set a value equal to the size of your RAM. For example my laptop has 4GB RAM so i set it to 4096.
Click ok, apply,ok, and it will restart.
The 100% problem will not bother you anymore! :)
You can send me a "thank you Greek guy" :)
Kisses from Greece,
Anastasios
UPDATE: Although the method solves the 100% hdd usage issue, changing the number of processors to 1 will impact performance. I've now unchecked the number of processors checkbox and only used the maximum memory one.