Oracle TNS Permission denied when creating database
Please, verify if you are installing Oracle 32bit or 64 bit.
This is important because Oracle in Metalink Knolwedge Base says:


  Getting ORA-12546 ORA-12560 and ORA-516 while creating the database
  (Windows64) (Doc ID 365852.1)
  
  You can run Oracle 32bit, on Windows 32bit.  OR  You can run Oracle
  64bit, on Windows 64bit. 
  
  You can not mix the versions.


Also, report the complete error stack.
Normally Oracle zip files have 32 or 64 bit eported in the name of the archive itself.
 Here you can find a lot of way to identify the executables architecture in Windows:
How to check if a binary is 32 or 64 bit on Windows?

Regards

Giova