Lsnrctl services does not show service XE - new install of Oracle Express

Question

It's a time-consuming and problematic installation of Oracle Express 11g, but for the moment just one question: why isn't service XE showing up in lsnrctl services? Here's that output, with Service XE missing:
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=EXTPROC1)))
Services Summary...
Service "CLRExtProc" has 1 instance(s).
Instance "CLRExtProc", status UNKNOWN, has 1 handler(s) for this service...
Handler(s):
"DEDICATED" established:0 refused:0
LOCAL SERVER
Service "PLSExtProc" has 1 instance(s).
Instance "PLSExtProc", status UNKNOWN, has 1 handler(s) for this service...
Handler(s):
"DEDICATED" established:0 refused:0
LOCAL SERVER
The command completed successfully
listener.ora is:
LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1))
(ADDRESS = (PROTOCOL = TCP)(HOST = 127.0.0.1)(PORT = 1521))
DEFAULT_SERVICE_LISTENER = (XE)
tnsnames.ora is:
XE =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = 127.0.0.1)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = XE)
slqnet.ora is:
SQLNET.AUTHENTICATION_SERVICES = (NONE)
NAMES.DIRECTORY_PATH = (TNSNAMES, EZCONNECT)

Answer 1

Well, I think this is progress, attempting to connect in sqlplus gives the error I had in SQL Developer when I had service XE showing up in lsnrctl services (that was the 2nd installation, now on the 3rd)
SQL> connect system/xxxxxxx
ERROR:
ORA-01034: ORACLE not available
ORA-27101: shared memory realm does not exist
Process ID: 0
Session ID: 0 Serial number: 0
So, couldn't connect and no luck with alter system register.
Yes, I should be OK with 127.0.0.1, both client and server are my home PC. Thanks for the idea of testing with no listener.ora at all - I renamed and moved listener.ora, for this interesting result: in sqlplus I either get the same ORA-01034 and ORA-27101, or 2 pages of a sqlplus help file, depending on the logon syntax used. I'm sure that's user error. In SQL Developer New Database Connection Test I get ORA-12514.
I've been closely following the thread from Marco ORA-01034 , ORA-27101 in windows Domain, and have learned a lot from you, Srini and TSharma. I think I'm leaning towards the possibility of a bad install. Task Manager shows process oracle.exe running (this may not mean much) and Services shows all the Oracle services Started. I don't know enough to interpret what I'm seeing for oracle.exe in Windows Process Explorer, although it looks like something is running. But suppose, hypothetically, that it was a bad installation, how would I test that?
Looking at the log files, I'm seeing clsc1.log is nearly identical to what Marco reported in that other thread:
Oracle Database 11g Clusterware Release 11.2.0.2.0 - Production Copyright 1996, 2010 Oracle. All rights reserved.
2013-04-12 01:25:47.968: [ default][3228]ut_read_reg:2:ocr registry key SOFTWARE\Oracle\olr cannot be opened. error 2
[    CLSE][3228]clse_get_crs_home: Error retrieving OLR configuration [0] [Error opening olr registry key. The system cannot find the file specified.
This may be another clue, the listener log file has this after a SQL Developer New Database Connection Test (test of Connection Type TNS + Network Alias XE, XE shows up just fine in the dropdown). My computer name is newamptron, and that host_addr IP is my DSL provider. Note the completely random port 2051. Essentially same message data with or without listener.ora in place.
<msg time="2013-04-12T23:55:46.593+00:00" org_id="oracle" comp_id="tnslsnr" type="UNKNOWN" level="16" host_id="NEWAMPTRON" host_addr="75.79.62.xxxx">
<txt>12-APR-2013 23:55:46 * (CONNECT_DATA=(CID=(PROGRAM=SQL Developer)(HOST=__jdbc__)(USER=Paul))(SERVER=DEDICATED)(SERVICE_NAME=XE)) * (ADDRESS=(PROTOCOL=tcp)(HOST=127.0.0.1)(PORT=2051)) * establish * XE * 12514</txt>
</msg>
<msg time="2013-04-12T23:55:46.609+00:00" org_id="oracle" comp_id="tnslsnr" type="UNKNOWN" level="16" host_id="NEWAMPTRON" host_addr="75.79.62.xxxx">
<txt>TNS-12514: TNS:listener does not currently know of service requested in connect descriptor</txt>
</msg>
Thanks!