If you go into your computer file(C:) > Program Files > EA Games > The Sims 2 > TSData > Res > User Data > Neighborhoods copy and paste the N001, N002, and N003 files into your folder Documents > EA Games > The Sims 2 > Neighborhoods. Those 3 folders you copied and pasted are the 3 base game neighborhoods, Pleasantview = N001, Strangetown = N002, Veronaville = N003. You can do this for any EP that comes with a neighborhood that you are missing. Hope I helped.