The problem is only when i click the VLC player. As soon as something is above the player, windows works as normal.
So i tested around abit with it, and took the task manager over the player, windows works fine, but as soon, as the task manager was away from the player, and you could see the video, windows is slow again.
So i fixed it by closing the VLC player from the task manager, and the problem did go away. But it all happens all over again if i do the same thing after quitting sins