ora-12705 cannot access NLS data files or invalid environment specified I have i'm installing oracle in machine 12c, while installing everything goes smoothly but when it reach to database creation it passes two step.


cleaning up failed stat
copying database file
creating and starting oracle instance 


on the last point (creating and starting oracle instance) it gives me following error:

ora-12705 cannot access NLS data files or invalid environment specified 


what I have tried is:


set env variable in windows to NLS_LANG=AMERICAN_AMERICA.WE8MSWIN1252
and also I have go ahead and rename the register edited of NLS 


those above point also mentioned in couple of search I did but still when I retry database creation I get same error all the time.

thanks for help
Thanks everyone, 

finally after trying many steps on changing registry and also environment variable in windows property, without any luck I ignored database creation during installation and proceed with installation without creating database.

after installation is done I manually created database by launching DBCA and all went well without any error in NLS_LANG.

hope this is helpful to someone else 

regards