Desk Top Gone After Changing Driver

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http://askubuntu.com – Ok, I am an Ubuntu complete newbie, and while I was trying to get to know my new system better, it seems that I changed the screen or the video driver to something wrong, and the desktop was gone, only one big picture, no sidebar no icons... nothing. I tried to reinstall Ubuntu (12.04) but no use. I run Firefox by launching the terminal (ctrl+alt+T) and write the name of the program just as it is "Firefox" and it worked with me! Any advice? Unfortunately I chose to install it to work beside the Win7 and now I have multi-boot, if this is information is going to be useful for you. (HowTos)