Remove Get Windows 10 on Windows 7

Hide the Get Windows 10 app (notification area icon)

For non-Enterprise versions of Windows, the notification icon can be suppressed through the Windows registry. To do this, set the following registry value:

Subkey: HKLM\Software\Policies\Microsoft\Windows\Gwx
DWORD value: DisableGwx = 1

How to manage the Windows 10 upgrade

To block the upgrade to Windows 10 through Windows Update, specify the following registry value:

Subkey: HKLM\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate
DWORD value: DisableOSUpgrade = 1

Source: https://support.microsoft.com/en-us/kb/3080351