Microsoft pushed out an update to your computer causing the pop-up to appear, relentlessly. Remove that specific update (KB3035585), and you remove the pop-up.
The following is intended for educational purposes only. If you have a tendency to mess things up, please stop here. Proceed at your own risk.
Open a command prompt as administrator, copy and paste the following text: WUSA /UNINSTALL /KB:3035583
Reboot when prompted.