ORA-12560: TNS:Protocal adaper error - oracle

I am new to oracle. I am getting an ORA-12560: TNS:Protocol adapter error., when I am trying to connect to an Oracle 11g database. But the all services are running.

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ORA-12560: TNS:protocol adapter error
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I am trying to login into my Oracle database as sys user through sqlPlus but I keep getting ORA-12560: TNS:protocol adapter error. One of the reason of this error is that oracle service not running however when I check services there is no OracleService there, there are only following services related to oracle and they all are already running.
Oracle - OraDb11g_home1TNSListener , Oracle - OraDb11g_home1clrAgent and Oracle MTS Recover service
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SSIS Connect Oracle 10g return error when create Datasource

I have installed Oracle 10g client (32 bit) on my OS Windows Server 2008 R2.
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TITLE: Connection Manager
------------------------------
Test connection failed because of an error in initializing provider. ORA-12154: TNS:could not resolve the connect identifier specified
In Datasource, i select Oracle Data Client Provider and fill tns service name in Server Name box.

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