Oracle: extract data from Oracle in Window Server 2008 (64 bit)

I need to create an application which is hosted in IIS under 64 bit Window Servers 2008. There are several steps needed to prepare and they are shown as below:

1. download 64 bit Oracle Client and install administration type
     win64_11gR2_client.zip

2. download 32 bit Oracle Client and install administration type
    win32_11gR2_client.zip

3. use Net Configuration Assistant to name a database into tnsname.ora

4. log off the window so that the system can update the environment.