Oracle Express 11g and Instant Client

I installed Oracle Express 11g on a Win 7 32 bit machine.
I verified from another machine I could connect to this instance using SqlPlus.
On a different Win 7 32 bit machine I downloaded and installed instant client.
I'm unable to connect to the Oracle Express 11g instance.
Firewall is turned off and User Account Control is set as low as it will go.
I set the PATH as it tells you too.
I did create a TNS_ADMIN pointing to tnsnames file I'm using.
But when I try connecting in SqlPlus using 'system @ dbname' I keep getting the following error message:
ORA-12154: TNS:could not resolve the connect identifier specified
I'm out of options.

http://edstevensdba.wordpress.com/2011/02/26/ora-12154tns-03505/
HTH
Srini

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hsawwan wrote:
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I want to download Oracle Instant client 64bit edition, but all the download sources are not available.
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