How to get rid of all W 10 on computer.

Hope someone can help please.
I am unable to update to W. 10. (Tried many times).
I would like to rid my computer of all reference to W 10.
So far, I have
Unreserved update, using "get windows app.
Uninstalled updates KB 3035583 and KB3021917 and have hidden these together with the Windows 10 update.
I have done a disk clean and recovered 1.2Gb from the update folders etc.
My C Drive is still showing about 3 Gb more than normal.
I am still getting the update "install W 10 update" whenever the updates are checked. This is stopping me from downloading the other important updates. As soon as I click get updates the W10 installation starts.
Is there anything else that I have not done. delete registry entries or something.
Thanks ion anticipation Jo

Use the Disk Cleanup Utility to remove system upgrade files.

Basically there will be a folder called $Windows.~BT on your C:\ drive, which contains the upgrade files. The Disk Cleanup Utility should remove this folder and free up the space.

If that does not work, you can still remove this folder by hand.

Thank you very much for your reply. I have done a disk cleanup and have removed the system files.
I do not have a $Windows~BT folder in my hidden folders. I have a $Windows~WS which seems to be 148Kb.
Here is the figures for my HDD.
3/9/15 61.83Gb
6/9/15 73.8 Gb
8/9/15 74.59 Gb
9.9.15 77.4 Gb. This is after I deleted and uninstalled all that I could.
I have not installed any new programs etc.
Any ideas please? Jo

I could imagine that you also have a Windows.old folder with some stuff in it...

Also there is an antimalware tool, I forget its name, which amongst other things can create a list of all files, which have been changed in the last x days. This tool offers that to see, if and which files have been modified, possibily with malicious intent, but it should also help just to get an overview, about which files are new...

Thanks for your help. All this has just started since W 10 updates. Jo