Hi everyone. I have a Samsung Galaxy Tab 2 7.0 On Android Jelly Bean and I have accidentally deleted my touchwiz files and now my tablet will not function properly. I do not have the Home/RecentApps/Back bar on the bottom of my screen and I do not have a notification bar. Also, these messages are always popping up frequently every minute: Unfortunately, email has stopped or Unfortunately, system ui has stopped or Unfortunately, settings has stopped. What should I do? One more thing, every time I choose a wi-fi network or try to enable usb debugging, the app crashes. Please help. Thank you.