Quick fix: open a command prompt as admin (Ctrl+Shift+Enter) and type: net stop "windows update" That will stop it until you reboot.... After that, uninstall

Quick fix: open a command prompt as admin (Ctrl+Shift+Enter) and type: net stop "windows update" That will stop it until you reboot.... After that, uninstall KB3035583 (choose to reboot later when prompted), then run the Disk Clean up tool and select the Clean up system files after the initial scan. Select the Temporary installation files for deletion. Longer version: http://winsupersite.com/windows-10/prevent-windows-10-upgrade-installing-after-making-your-reservation http://winsupersite.com/windows-10/prevent-windows-10-upgrad... If you are up to editing the registry via regedit, the key is: HKLM\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate DWORD value: DisableOSUpgrade = 1 See: How to manage Windows 10 notification and upgrade options https://support.microsoft.com/en-us/kb/3080351 https://support.microsoft.com/en-us/kb/3080351