Oracle 11g XE and SQL Developer

Hello:

Very new here.  I don't know where to post anything.  My apologies, but I'm all over the room.

I installed 11g and downloaded SQL Developer (not even sure if it should be "installed" because it's just a zip file).

In any case, on the SQL command line I get SYSTEM CONNECT, then my password.  I get the following error:

ORA 12154: TNS could not resolve the connect identifier specified.

Also, the "get started" link not working anymore.  Don't know what's happening, or if it is specific to my laptop.  I tried to connect two days without result.

Thanks for any help.

Your headset does not work: OracleXETNSListener service started?

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