I installed Debian (Wheezy 7.9) as a VM in VirtualBox. But looks like I have a Desktop environment problem: 

1. When I right-click on the Desktop, I get nothing (I'm supposed to get a menu).
2. No computer or home icons (even-though they are enabled in Advanced Settings).

BTW, when I enable 3D acceleration for this image on the VBox, the image crashes when logging.

PS: 

* Win7 is the OS on which I have VBox installed
* GNOME3 is my Desktop environment