MS ODBC Installation Error issue

Hi,
The below error appears, when I was trying to install OBDC for Oracle database. Before this error ,every thing is working normally and installation goes just fine.
This error appears when installation of OBDC starts to install and tries to connect to oracle database.
It says that, I can’t install this OBDC, until the client networking components are not installed.
I want to know that, where can I find the client networking components to install.
If somebody know about this, then please help me.
I tried a verity of client components to install, but didn’t help me out.
I also tried to search out these components, but couldn’t find any.
Please help.
Microsoft ODBC for Oracle
The Oracle(tm) client networking components were not found. This component are supplied by Oracle
Corporation and are part of the Oracle Version 7.3(or greater) client software installation.
You will be unable to use this driver until these components have been installed.
THANKS.
