Hi,
I installed Oracle database 12c yesterday in my Win 7 64bits Desktop computer, and it seem that the installation was correct because i am able to create tables,... using Sql Plus.
I discovered the problem when i tredy to use Toad to connect it, it says that there is a problem with my listener as you can see in the image below.

When i start the listener this is what it shows.

and my listener. ora is this:

my system variables are those:
ORACLE_HOME -> D:\Oracle\product\12.1.0\dbhome_1
ORACLE_HOME_NAME -> D:\Oracle\product\12.1.0\dbhome_1
Path -> D:\Oracle\product\12.1.0\dbhome_1\bin;D:\Oracle\App\product\11.2.0\client_1;D:\Oracle\App\product\11.2.0\client_1\bin;C:\oraclexe\app\oracle\product\11.2.0\server\bin;%SystemRoot%\system32;%SystemRoot%;%SystemRoot%\System32\Wbem;%SYSTEMROOT%\System32\WindowsPowerShell\v1.0\;C:\Program Files (x86)\ATI Technologies\ATI.ACE\Core-Static;C:\Program Files (x86)\Microsoft ASP.NET\ASP.NET Web Pages\v1.0\;C:\Program Files (x86)\MKVtoolnix;C:\Program Files\Microsoft\Web Platform Installer\;C:\Program Files (x86)\MySQL\MySQL Utilities 1.3.6\
SQL_PATH -> D:\Oracle\product\12.1.0\dbhome_1
TNS_ADMIN -> D:\Oracle\product\12.1.0\dbhome_1\NETWORK\ADMIN
and my directory estructure is this:

I have tried for 6 hours to solve this problem but i can't see what i wrong.
I need help becasue in some days i will have a work interview and i wanna refresh all my knowledge with reports/forms and try the new 12c database.
If need any information please let me know.
Thx to all who try to help.