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My interpretation is that you have never actually connected to Oracle and that the Oracle
version you have has never been patched and is so old it is currently in desupport mode.
Hire a consultant who knows something about Oracle and have them deal with the many issues you are facing.
One issue that just jumps out at me is this: "Covers .exe"
There should not be a space in there.
TNS 12560 error is a serious one. It is surprising your application has 'worked' with it. This is due to configuration issues, you should test if you can perform a connection against the database using these parameters and using a regular sqlplus client.
I tried to restart the service of my Oracle10gTNSListener to get the changes I made over my listener.ora, but afeter I did stop and start it shows me "SOme services stop automatically if they have no work to do"...