De_Cadanz, Попробуй вместо Provider=MSDAORA.1 использовать Provider=msdaora; или строку подключения
Provider=OraOLEDB.Oracle; (https://www.connectionstrings.com/oracle-provider-for-ole-db-oraoledb/)

Возможно, проблема связана с версией установленного клиента 32/64
https://overcoder.net/q/1667500/%D0%BF%D0%BE%D1%81%D1%82%D0%B0%D0%B2%D1%89%D0%B8%D0%BA-msdaora1-%D0%BD%D0%B5-%D0%B7%D0%B0%D1%80%D0%B5%D0%B3%D0%B8%D1%81%D1%82%D1%80%D0%B8%D1%80%D0%BE%D0%B2%D0%B0%D0%BD-%D0%BD%D0%B0-%D0%BB%D0%BE%D0%BA%D0%B0%D0%BB%D1%8C%D0%BD%D0%BE%D0%BC-%D0%BA%D0%BE%D0%BC%D0%BF%D1%8C%D1%8E%D1%82%D0%B5%D1%80%D0%B5

https://community.oracle.com/tech/developers/discussion/1022162/msdaora-provider-is-not-registered-on-local-machine