Cannot connect to Oracle 11g XE through SQLPlus

Question

Have been trying to resolve this all day. I have Oracle 11g XE installed on my local desktop (Windows 7 64 bit)for which I have been using for over a year for development. The recent "Sandy" storm killed the power at our office for a week. Upon returning to the office, I can not seem to connect to the Oracle on my desktop from my desktop. The only thing that supposedly have changed was the router re-assigned IP addresses. However, I have modified my tnsnames to reflect the proper IP address. Still I get the below error trying to connect through SQL*Plus (without specifying the service):
ERROR:
ORA-01034: ORACLE not available
ORA-27101: shared memory realm
Process ID: 0
Session ID: 0 Serial number: 0
When I try to specify the service name "...system/password@xe", it gives me the following error:
SQL*Plus: Release 11.2.0.2.0 Production on Thu Nov 8 19:54:17 2012
Copyright (c) 1982, 2010, Oracle. All rights reserved.
ERROR:
ORA-12514: TNS:listener does not currently know of service requested in connect
descriptor
Here's the results from ipconfig
IPv4 Address. . . . . . . . . . . : 192.168.80.194
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . : 192.168.80.1
Here's my tnsnames.ora
XE =
(DESCRIPTION =
(ADDRESS_LIST =
          (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.80.194)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = XE)
     (SID = XE)
EXTPROC_CONNECTION_DATA =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1))
(CONNECT_DATA =
(SID = PLSExtProc)
(PRESENTATION = RO)
ORACLR_CONNECTION_DATA =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1))
(CONNECT_DATA =
(SID = CLRExtProc)
(PRESENTATION = RO)
listener.ora
SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(SID_NAME = PLSExtProc)
(ORACLE_HOME = C:\oraclexe\app\oracle\product\11.2.0\server)
(PROGRAM = extproc)
(SID_DESC =
(SID_NAME = CLRExtProc)
(ORACLE_HOME = C:\oraclexe\app\oracle\product\11.2.0\server)
(PROGRAM = extproc)
LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1))
(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.80.194)(PORT = 1521))
DEFAULT_SERVICE_LISTENER = (XE)
sqlnet.ora
# This file is actually generated by netca. But if customers choose to
# install "Software Only", this file wont exist and without the native
# authentication, they will not be able to connect to the database on NT.
SQLNET.AUTHENTICATION_SERVICES = (NTS)
NAMES.DIRECTORY_PATH = (TNSNAMES, ONAMES, HOSTNAME)
lsnrctl service output
LSNRCTL for 32-bit Windows: Version 11.2.0.2.0 - Production on 08-NOV-2012 19:48
:55
Copyright (c) 1991, 2010, Oracle. All rights reserved.
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
lsnrctl status output
LSNRCTL for 32-bit Windows: Version 11.2.0.2.0 - Production on 08-NOV-2012 19:56
:48
Copyright (c) 1991, 2010, Oracle. All rights reserved.
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=EXTPROC1)))
STATUS of the LISTENER
Alias LISTENER
Version TNSLSNR for 32-bit Windows: Version 11.2.0.2.0 - Produ
ction
Start Date 08-NOV-2012 19:56:41
Uptime 0 days 0 hr. 0 min. 11 sec
Trace Level off
Security ON: Local OS Authentication
SNMP OFF
Default Service XE
Listener Parameter File C:\ORACLEXE\APP\ORACLE\PRODUCT\11.2.0\SERVER\network\a
dmin\listener.ora
Listener Log File C:\oraclexe\app\oracle\diag\tnslsnr\EWANG-W7\listener\
alert\log.xml
Listening Endpoints Summary...
(DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(PIPENAME=\\.\pipe\EXTPROC1ipc)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=192.168.80.194)(PORT=1521)))
Services Summary...
Service "CLRExtProc" has 1 instance(s).
Instance "CLRExtProc", status UNKNOWN, has 1 handler(s) for this service...
Service "PLSExtProc" has 1 instance(s).
Instance "PLSExtProc", status UNKNOWN, has 1 handler(s) for this service...
The command completed successfully
Both the "OracleServiceXE" and "OracleXETNSListener" has been started.
Would really appreciate it if someone can help me resolve this. Thanks!

Answer 1

Found the log. Below is the latest:
Dump file c:\oraclexe\app\oracle\product\11.2.0\server\rdbms\trace\xe_ora_25252.trc
Fri Nov 09 10:12:25 2012
ORACLE V11.2.0.2.0 - Production vsnsta=0
vsnsql=16 vsnxtr=3
*** 2012-11-09 10:12:25.530
Oracle Database 11g Express Edition Release 11.2.0.2.0 - Production
Windows NT Version V6.1 Service Pack 1
CPU : 4 - type 586, 4 Physical Cores
Process Affinity : 0x0x00000000
Memory (Avail/Total): Ph:11433M/16359M, Ph+PgF:20698M/32717M, VA:3843M/4095M
Instance name: xe
Redo thread mounted by this instance: 0 <none>
Oracle process number: 0
Windows thread id: 25252, image: ORACLE.EXE (SHAD)
*** 2012-11-09 10:12:25.542
2012-11-09 10:12:25.530: [ default]ut_read_reg:2:ocr registry key SOFTWARE\Oracle\olr cannot be opened. error 2
2012-11-09 10:12:25.544: [ default]ut_read_reg:2:ocr registry key SOFTWARE\Oracle\ocr cannot be opened. error 2