I have installed a trial version of ESET Smart Security 9. It has a notification when there are new updates to Windows available. And currently it shows me 10 updates (interface is in Polish):
However, when I go to Windows Update (either by clicking "Run System Update" button or searching in start menu) there are no updates available:
In "Advance options" I have "Give me updates for other Microsoft products when I update Windows" checkbox checked.
Is this ESET's bug (but how does it know about these 10 updates?) or is Windows lying to me?