连接Oracle数据库提示“OraOLEDB.Oracle.1未注册”错误

Oracle 9i，连接字符串是：Provider=MSDAORA.1;Password=drcom;User ID=drcom;Data Source=city;Persist Security Info=True;min pool size=4;max pool size=10 Oracle 9i，连接字符串是：Provider=MSDAORA.1;Password=dr