server with Oracle

I installed the Oracle client on my computer, and I can connect to oracle databases using SqlPlus, however when I try setting up the linked server I get the following error after I try executing a query.
OLE DB provider 'MSDAORA' reported an error.
[OLE/DB provider returned message: ORA-12560: TNS:protocol adapter error
]
OLE DB error trace [OLE/DB Provider 'MSDAORA' IDBInitialize::Initialize returned 0x80004005: ].me to getting the same problem so u got the solution please tell to me

my Address:
A. Shiva Prasad
GIS Developer
MIDWEST INFO TECH Pvt Limited
70, kanakapura main road ,J.P. nagar 6th phase
opposite Family mart
Bangalore - INDIA
mail id : shiva.prasad@.midwestinfotech.com alternate mail : asp.347@.gmail.com
mobile : +919886451711

|||This looks more like a protocol adapter error. This indicates that Oracle client does not know what instance to connect to or what TNS alias to use. Try fixing the tnsname.ora file so that it points to the correct instance