Oracle XE 11g the XE database was not found
<p>I am a new one who started to use Oracle Database and faced the problem during installation the last verstion of <code>Oracle XE 11g</code> x64 to the Microsoft Windows 7 x64 Enterprise. </p>

<p>During installation were not any errors and Windows Services (<code>OracleXETNSListener</code> and <code>OracleServiceXE</code>) were successfully created and started. 
<a href="https://i.stack.imgur.com/QjReN.png" rel="noreferrer"><img src="https://i.stack.imgur.com/QjReN.png" alt="Winservices screen"></a></p>

<p>However, when I try to get the list of available databases I receive an error </p>

<blockquote>
  <p>ORA-01034: ORACLE not available</p>
</blockquote>

<p><a href="https://i.stack.imgur.com/GDHz3.png" rel="noreferrer"><img src="https://i.stack.imgur.com/GDHz3.png" alt="ORA-01034: ORACLE not available"></a></p>

<p>For some reason the <strong>XE database was not created</strong> into <code>%ORACLE_BASE%\oradata\XE</code>. 
<a href="https://i.stack.imgur.com/Otqds.png" rel="noreferrer"><img src="https://i.stack.imgur.com/Otqds.png" alt="enter image description here"></a></p>

<p>The content of my listener.ora with localhost:</p>

<pre><code>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 = 127.0.0.1)(PORT = 1521))
    )
  )

DEFAULT_SERVICE_LISTENER = (XE)
</code></pre>

<p>I fixed tnsnames.ora by setting localhost IP address:</p>

<pre><code>XE =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = 127.0.0.1)(PORT = 1521))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = 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) 
    ) 
  ) 
</code></pre>

<p>sqlnet.ora contains both services:</p>

<pre><code>SQLNET.AUTHENTICATION_SERVICES = (NONE;NTS)
</code></pre>

<p>The log file from '%ORACLE_HOME%\server\log\myhost\client' contains this error:</p>

<blockquote>
  <p>Oracle Database 11g Clusterware Release 11.2.0.2.0 - Production
  Copyright 1996, 2010 Oracle. All rights reserved. 2016-01-20
  19:51:43.920: [ default][5096]ut_read_reg:2:ocr registry key
  SOFTWARE\Oracle\olr cannot be opened. error 2 [<br>
  CLSE][5096]clse_get_crs_home: Error retrieving OLR configuration [0]
  [Error opening olr registry key. Не удается найти указанный файл. ]</p>
</blockquote>

<p>How can I find what goes wrong and fix the problem?</p>