My concern is that, last Saturday morning, i have no problems with Windows, i can navigate it properly. When night came, as I press the windows key, all of a sudden it started to navigate on its own. When i opened the settings to check the windows defender, it navaigates in its own like presses tabs and all. But when i open other apps, there's no problem at all. Just the windows itself. What may be the problem? A virus?