In your My Documents<EA Games<Sims 2<Neighborhoods file, delete the N001 file (or move it to your desktop should you decide you want it back)
(In my computer, under Program Files (x86) not sure if you are under 32-bit or 64-bit) <EA Games<Sims 2<TSData<Res<UserData<Neighborhoods, copy N001 and paste it where you deleted the previous one.
*N002 is Strangetown and N003 is Veronaville.
The other neighborhoods are located within their corresponding EP files. G001 is Riverblossom Hills, F001 is Desiderata Valley and E001 is Belladonna Cove.
If you have the Ultimate Collection, it's different. To get a new copy -
C:\Program Files (x86)\Origin Games\The Sims 2 Ultimate Collection\Double Deluxe\Base\TSData\Res\UserData\Neighborhoods
Comments
(In my computer, under Program Files (x86) not sure if you are under 32-bit or 64-bit) <EA Games<Sims 2<TSData<Res<UserData<Neighborhoods, copy N001 and paste it where you deleted the previous one.
*N002 is Strangetown and N003 is Veronaville.
The other neighborhoods are located within their corresponding EP files. G001 is Riverblossom Hills, F001 is Desiderata Valley and E001 is Belladonna Cove.
It's been a while since I've had to do this, so it was a good exercise on going through the files to find the path.
C:\Program Files (x86)\Origin Games\The Sims 2 Ultimate Collection\Double Deluxe\Base\TSData\Res\UserData\Neighborhoods
Or download a cleaned up version of Pleasantview:
https://meetme2theriver.livejournal.com/63030.html#cutid1