unity - 13.04 launcher and menu bar disappeared

Last night I downloaded python 3.3 and idle. I turned it on today and the launcher and menu bar disappeared. It didn't even ask for my password and all I see is my desktop. I tried finding answers from many places: Launcher, top Panel, and window decorations missing after 12.04 upgrade, Unity has disappeared, and How do I reset my Unity configuration?. But they all did not help and I do not know what to do. I tried unity --reset many times and it says reset option is now deprecated. I am not sure if this means anything but sometimes there are internal errors and when I try to show the details some directory which includes /bin. comes out and nothing else. Any help would be greatly appreciated.