Oracle 11g XE and SQL Developer

Hello:
Very new here. I'm not sure where to post anything. Apologies, but I'm all over the board.
I've installed 11g and downloaded SQL Developer (not even sure if this needs to be "installed" as it's just a zip file).
Anyway, at the SQL command line I enter CONNECT SYSTEM and then my password. I get the following error:
ORA 12154: TNS could not resolve the connect identifier specified.
Also, the "get started" link does not work either. Not sure what's going on or if it's specific to my laptop. I've been trying to connect for two days to no avail.
thank for any help.

c\> lsnrctl stat
LSNRCTL for 64-bit Windows: Version 11.2.0.2.0 - Production on 08-SEP-2014 12:28:18
Copyright (c) 1991, 2014, Oracle. All rights reserved.
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=EXTPROC1)))
TNS-12541: TNS:no listener
TNS-12560: TNS:protocol adapter error
TNS-00511: No listener
64-bit Windows Error: 2: No such file or directory
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=CFXXXXXXX.xxxxxxxxxxxx.com)(PORT=1521)))
TNS-12541: TNS:no listener
TNS-12560: TNS:protocol adapter error
TNS-00511: No listener
64-bit Windows Error: 61: Unknown error

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