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The 'OraOLEDB.Oracle' provider is not registered on the local machine.

I am new Oracle database. I am trying to connect to oracle 11g database from my c# program and I am getting above error. I have Oracle Client 10.2.0 installed on my windows xp machine. When I try to connect I am getting this error. I can connect to the database via SQLPlus and Toad with no problem. Is there any other configuration I need to make?
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