Lost "Default" Administrator Files

My daughter has been using her computer under Widows XP for 3-4 years. She did not set up a user when she got the computer, and everything defaulted to the "default" Administrative User. She's headed to college and decided to set up users so her parents (me) wouldn't be able to snoop around on her computer while she is away. She set herself up as the adminstrator user account and several other non-admin users (mom, dad, brother). The "default" admin user went away after she set herself up as administrator, and thus all of the files/work she had accumulated over the last 3-4 years. Any way of recoverying the files associated with the default admin user account?