To remove KB3035583, first open Windows Update and click “Installed Updates” in the bottom-left corner. To quickly find KB3035583, you can sort by name. Once you've located it, right-click and choose “Uninstall”.Jun 2, 2015
Microsoft delivered this notification through a program which is installed through Windows update. The upgrade assistant is named GWX.exe in C:\Windows\System32\GWX. If you are not interested in Windows 10, you can remove this program from your PC.
Go to Windows Update->Installed update, remove KB3035583.
What is KB3035583?
The worst thing about KB3035583 is that it is an executable that starts with your system.
The executable “GWX.exe” autostarts through the Task Scheduler. GWX.exe is the system tray icon. When you click the system tray icon, it spawns the application “GWXUX.exe”, which is the upgrade dialog discussed earlier.
Source: ACCRA24.COM | GHANASKY.COM