12.10 lost window maximize and minimize options, utility bar and launcher lost too

Question

I recently installed Ubuntu 12.10 on my Dell Inspiron 7520. Everything is good except the hyperactive fans.The graphic cards are Intel and AMD Radeon 7730. I am trying to get away with the fan problem butI don't really know the terminal hence I am just trying to use the commands available on the forums.But this time I don't know what did I do that now I don't have the utility bar, launch bar and the basic features like the window minimize and maximize don't work. I have this impression I may have uninstalled some drivers . But still not sure what to do. Feel a need of dire help!