I tried to follow this tutorial frome ghacks.net. But I end up with a bug. Everytime I try to change the desktop background or the theme. It opens up lots of folders. And then close it back again. So I cannot do anything when I try to change the background or the theme to the default. Here is the tutorial

And I can't even shutdown my machine now, please help.

EDIT I tried executing these commands in the terminal

sudo add-apt-repository ppa:erik-b-andersen/rgba-gtk
sudo apt-get update && sudo apt-get upgrade
sudo apt-get install gnome-color-chooser gtk2-module-rgba
sudo apt-get install murrine-themes

And it installed gnome color changer. It works, and the windows became transparent, but I can't change to the default theme and I can't put a background

Here's the screenshot, when I try to change something in the preferences:

Its just okay if I can't change the theme, but it won't let me change the background either. Or maybe the background is changed but its transparent just like the other windows. You can see that in the taskbar(or whatever its called in Ubuntu). Its full. What can I do to atleast make the background visible.