NOTE: I am assuming that you do NOT want to "upgrade" to windows 10, if you DO want to "upgrade" then leave the gwx files, adn the listed updates, as they are.
The GWX files are contained within 4 folders:
These folders have names beginning...
Within these folders are files with the following names, some file names are listed twice because they occur in more than one folder...
I uninstalled the updates responsible for these, then* I renamed all these files (just added a word to the start of their name), then I zipped up those folders, copied the zip files out of the WinSxS folder, then deleted those folders, and all the files (as listed above) within them. Finally, with the zip files containing all this nasty stuff now in a sub folder of my "Documents" folder, I renamed those zip files to .txt files. If I ever wanted to restore these GWX files I could rename those txt files to zip, then unzip them to get the folders back, take the extra word away from the front of each file name, and then copy those folders back into WinSxs, so they are not totally gone, but they are in a place where the operating system can never find them to run them. This did no damage to my computer, but making a system image first is ALWAYS wise, and can prove very helpful in a wide range of circumstances.
If you are at any point unsure as to whether the files you have found are the relevant ones, then ask for help identifying them. For example there are probably thousands of files on a computer called "config.xml", you need to make sure that only those which occur in one of those listed folders get renamed like this, files with similar names in ANY OTHER folder should not be interfered with.
If you want to get rid of GWX then you should begin by uninstalling KB3035583, KB3044374, KB3046480, KB3068708, KB3022345 and KB3058168, (not all of them are necessarily present, you might only find some of them) then restart. Then search in windows file explorer, search the whole of C:\ drive for the keyword gwx. When searching make sure that file explorer is set to show "hidden files and folders", it should NOT need to be set to show "protected operating system" files though. Post a list here of all the files which the search for "gwx" returns, if any, and of all the folders with gwx in their name. I don't think uninstalling those updates will get rid of all traces of GWX, so there will probably be some gwx things coming up in that search. If there are then I can look at the list of gwx related files you found and tell you what to do about them, if that search retruns no results then there are no traces of gwx left and uninstalling those updates has been enough to get rid of GWX.
*after changing permissions on those 4 listed folders, and the 9 files within them, do not change the permissions on any other files or folders
P.S. here is how to make a system image http://www.bleepingcomputer.com/tutorials/create-system-image-in-windows-7-8/#manual
you should make one before beginning with any of this, because in the extremely unlikely event that this causes problems a system image lets you go back to before the problems began. And if you don't need the system image now, having it around for later will be very helpful, system images can help restore your system after: damage to system files, virus infection, hard-drive failure, buggy updates, unwanted changes to system settings, unwanted installation or uninstallation of programs...
P.S. Aura, just to make a note of it, after I did the uninstallation, and then deletion, which I describe, I did (amongst other things) run SFC (on the "check only and say if it finds any errors" setting) it didn't report problems from doing this. Naturally I haven't poked around in the registry at all, but I certainly haven't experienced any errors of any kinds.
Edited by rp88, 07 August 2015 - 12:27 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