I have copied the folders back to the base dir (like C:\PostgreSQL \data\base\16404) if that's step one but what after that?Just start Postgres. If the data dir is ok, it should run fine.
It's unclear from your description whether the raw DB files were moved from another installation - note that the above is only guaranteed to work if architecture/compiler/etc. are all the same. If the files were created by exactly the same PG instance, then you should be okay.
- John D. Burger MITRE
