Connection String Setting For Oracle9i

Here I got problem on setting the connection string to access oracle9i database.

I already declare the following connection string

cn.ConnectionString = "Provider=OraOLEDB.Oracle.1;Password=ORACLE;Persist Security Info=True;User ID=SYSTEM;Data Source=WWW"

also I define cn As New OleDb.OleDbConnection()

However, an error occurs when call cn.Open()
and return expection error "OleDbExpection Error"

How can i solve this problem?