In my desktop all icons are appearing with shadow in its back side
and all names of these icons are appearing in a rectangular box with
different colour than desktop.
I have adjusted "Use drop shadows for icon labels on the
Desktop" from Control Panel/System/Advanced/Performance/Settings. But this
still doesn't do the trick. And I have observed that Lock Web Items on
Desktop is un-checked by right-clicking the desktop, point to Arrange Icons.

How I can reset or change the appearence of desktop Icons.