Welcome screen was disabled in regedit

I was fooling around in reg-edit trying to change the name of the documents folder from my wife's name to mine (Stupid I know and a learning experience) anyway it changed my account from administrator to user that took me a couple hours to fix but now if I go to control panel and users even if I click on "Use Welcome Screen" when I restart it doesn't show up I have to type my user name and password, I have even logged on as Administrator in safe mode and unchecked "Make users log on with ctrl alt del" and it still won't use welcome screen. Can somebody help me to fix this.