ORA-12154 error when logging into SQL*Plus

I installed Oracle 10g (10.2.0.3.0) server on a Hyper-V virtual machine running Windows Server 2008 Enterprise as a standalone server. I did a software only install and then ran the Database Configuration Assistant to create a database. I also ran the Oracle Net Configuration Assistant to configure the Listener, Naming Methods, and Local Net Service Name. I ran the test in the Net Configuration Assistant and it was successful after I changed the login credentials to use the SYSTEM account and password. TNSPING of the net service name is successful. I can also successfully connect to the database via Enterprise Manager using the SYSTEM account and password. What I can NOT do is connect locally to the database via SQL*Plus (either through the gui or command line). I get the following error:
ERROR:
ORA-12154: TNS: Could not resolve the connect identifier specified
I've checked and double-checked the LISTENER.ORA, SQLNET.ORA, and TNSNAMES.ORA files. They all seem correct to me, especially since I used the configuration assistants to create them.
Anyone have an idea what might be wrong or what I can check next? Any help would be appreciated!
Thanks!

They all seem correct to me, especially since I used the configuration assistants to create them. Garbage In, Garbage Out.
Since Oracle throws an error, I strongly suspect you are mistaken.
Simply put, you are using something like "@REMOTE" someplace & somehow and the error indicates SQL*Net does not know to what @REMOTE refers.
How many systems are involved, names, OS version, etc?
post connection string & post contents of tnsnames.ora file.

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ORA-12154 error when logging into SQL*Plus

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