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This could be caused by a number of issues. First, I'd try to manually type in the connection string using this syntax:
If this works then there's an issue with the tnsnames.ora file. If there are other files in the folder containing the tnsnames.ora file, that could throw things off.
If that doesn't work then there's likely an issue with the driver. Not sure, but having the two Oracle drivers on your machine could be throwing things off too. Make sure the path is set to the correct driver in your environment variables (i.e. put the correct path as the first entry in the path see link to instructions below).