Why can't I drag in Taskbar?

[Liloy]

So I've reinstalled Windows but keeping my files a month ago, and after reinstalling all my apps the dragging ONLY in Taskbar won't work (when you drag an app in the taskbar), before reinstalling everything was working. I've noticed that when I try to select a text it deselects by itself or something like that, I've encountered the problem on a lot of applications. I've noticed, too, that the peak window thing when you put your mouse over started flickering, and idk why. However, I needed to reinstall completely Windows, so I did that, and I thought the problem was gone, but seems I have it ag

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