You need to set windows update to "check automatically but ask me whether I want to download", this way you can make sure only the updates you actively say ok to can get onto your computer. In future only accept security updates (those named "Security Update for..." where ... is the name of a piece of software), or better than that, make sure to check the "more information" link for each update, then don't install any which act to "enable upgrades" "create new upgrade scenarios"...
Make sure however to do that update checking every tuesday evening or wednesday morning, you want to make sure to get the security updates as quickly as possible. You could set a phone alarm or scheduled task to remin you to do this. An good message for this alrm might be something such as:
"time for updates! go to control panel-->windows update-->check for updates, then when it has checked click on "X important updates", untick everything, then retick all those named "Security Update for...". Then with those and only those "Security Update for..." updates selected click the button to install, let them download, disconnect from the internet once the download finishes, then restart as soon as it asks you to. After restarting go back to windows update and hide (right click and choose "hide") any updates which are unwanted."
Furthermore there are some other updates you need to remove, specifically you must remove all the recent updates to the windows update client, these have been used to alter the windows update client so it is capable of offering windows 10 as an update, without these updates to the windows update client it should not be possible for windows 10 to be offered to you. Removal of the updates can be done by a comman prompt method, or through the GUI by going into "installed updates" in the windows update menu and selecting the unwanted ones then uninstalling them.
Another thing worth doing is looking at your C:\ drive, make sure hidden files and folders are set to be shown, do yu see a folder called $WINDOWS.~bt if so this is likely where the many GB of windows 10 update files are kept, you could delete the folder from the file browser, but would need to do a lot of bothersome things involving "taking ownership" and "giving yourself permissions" first, things which if done by accident to other folders could be harmful. much easier to dispose of the windows 10 related files using disk cleanup, it should have otpions specifically to do this.
After all the other steps search your C:\ drive for a file called gwx.exe, tell us if any are found, if you find them then you ought to delete them, but this must be done in a special way, don't try it yourself until further advice on how has been given, just say of you find them, then we'll advise on how to delete them if needed.
The following list might be helpful to you, it's a thread I run advising on which windows updates to download and which to avoidhttp://www.bleepingcomputer.com/forums/t/551980/the-windows-updates-monitoring-thread/
P.S. after removing all the windows 10 related updates, there are lists on some places including in a few threads on this site, and setting updates to "check automatically but ask me whether I want to download" I suggest starting another thread to ask for help with any remaining problems with windows update, such as if it's being buggy and failing when you try to check for updates.
Edited by rp88, 18 February 2016 - 02:10 PM.
Back on this site, for a while anyway, been so busy the last year.
My systems:2 laptops, intel i3 processors, windows 8.1 installed on the hard-drive and linux mint 17.3 MATE installed to USB