I have a Dell XPS 8700 that I previously upgraded to Win10 and then rolled back to Win7 for game compatibility. After the restoration of Win7, I disabled GWX. Yesterday I ran GWX Control Panel to insure that I had killed any Win10 pending upgrade. Out of curiosity I ran SFC and when it reported that it had found errors and corrected them I checked the CBS.log file and discovered that it had restored GWX and all of fits supporting files. Needless to say I used GWX Control Panel to nuke the upgrade again. Curiosity is always a good thing!