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MYDB_ALIAS = (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.1.50)(PORT = 1521)) (CONNECT_DATA = (SERVER = DEDICATED) (SERVICE_NAME = ORCL) ) )

This usually means the application is 32-bit, but you installed the 64-bit client (or vice versa). You cannot mix architectures. If you need to support both 32-bit and 64-bit applications, you must install both clients in separate directories (a feature known as "Oracle Home Support"). oracle client for windows 64 bit download

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