There is a way to prevent this happening by only receiving critical updates via windows update and removing the following patches from your system, then hiding them in Windows Update.
Still on W7Pro 32 & 64 bit with no nags for GWX or the stealth upgrade.
Telemetry Patches removed from my systems (so far):
KB2876229 SKYPE. (I dont use it)
KB3022345 Replaced by KB3068708 Telemetry
KB3022345 Caused false sfc result
Takes around 20 mins to do but, well worth it to have your personal computer back (correct as of 11/09/15)
[Updated due to having full descriptions of patches which were not available at the time of release.]
RDP and Russian Ruble new symbol (non telemetry, adware, spying etc..)
Better safe than sorry at the time :-D