sql server - Error trying to connect to Oracle DB with SSIS? -

i'm trying connect oracle database using ssis, i'm getting following error:

test connection failed because of error in initializing provider. oracle client ,  networking components not found. these components supplied oracle  corporation , part of oracle version 7.3.3 or later client software installation. provider unable function until these components installed. 

a search returned this link , downloaded zip files in oracle instant client. have no idea contents of these zip files.

another link mentions download microsoft connector oracle attunity, again, don't know them.

any appreciated.

i'm using sql server 2008 r2, windows server 2008, , vs2008. don't version of oracle db's in.