Tikiuos angliskai supranti:

Four things are required for transparent icon backgrounds:

1) System Properties>Advanced>Performance Settings>VisualEffects - check
"use drop shadows for icon labels".
2) Right-click on Desktop ->Arrange Icons by>Lock Web items must be cleared.
3) If you have any web content on your desktop, transparency won't work. To
check for web content: Display Properties>Desktop>Customize Desktop>Web -
make sure all checkboxes are clear.
4) Wallpaper must be an image file, not html.