HELP: Username vanished on Windows XP 64 bit!!

Ok this is kind of a long story. There may be a simple answer to this, but I still need one I am not so smart on the simplelist things. I recently made another account called RESTRICTED. My main account was call ADMINISTRATOR. Neither of them had passwords to them. I never used the RESTRICTED account. Well while on my main account "ADMINSTRATOR" I was installing something. It wanted me to restart, but when I went to shut down I wasn't paying attention and clicked switch users. I went back to the welcome screen and my MAIN ACCOUNT ADMINISTRATOR WAS GONE!! The only one left was Johnny. Now I backed up all my stuff when I logged into it, but I still want my account back :(. I did a system restore and it said some settings may not return due to some files not being on the hard drive anymore or something. I did it anyway and it did not work. So now I restored the system restore and am back to where I left off. PLEASE I need back on my other account, CAN ANYONE HELP?