I went to group policy editor and enabled "turn off taskbar thumbnails". I turned off and on my computer. The setting does not apply. I still see the thumbnails. Also, I disabled notifications which pop up when you hover over an icon on the taskbar. Nope, they still appear. Why group policy settings do not apply? At my user account I am the administrator so I have control over the computer. How can I solve this problem? I simply dont wnt thumbnail previews.