I have a 2 gray ? on my HD computer window

I have a 2 gray ? on my HD computer window.

Let me try and explain as I am not the best with computer language and descriptions.

When I open the HD icon on my desktop the window that opens has on the top icons for back and forth, various ways of displaying the items, an eye for description and a wheel for action.

In between them there are 2 gray ? (Question Marks), when I click them on it says : "this Item cannot be found"

How do I remove the ? from the top row,

I tried a restart but that did not work.

Thanks,

Greg