先从控制面板删除oracle的相关应用及数据库，
删除系统变量
ORACLE_OEM_CLASSPATH=%JAVA_HOME%\lib\ext\access-bridge-64.jar;%JAVA_HOME%\lib\ext\jaccess.jar
.....
CLASSPATH=.;%JAVA_HOME%\lib\dt.jar;%JAVA_HOME%\lib\tools.jar
PATH=D:\app\Administrator\product\11.2.0\dbhome_1\bin;C:\Program Files\PHP\v5.3;C:\Program Files (x86)\Internet Explorer;C:\Program Files\Common Files\VSL Utils;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Program Files\Microsoft\Web Platform Installer\;C:\Program Files (x86)\Microsoft \ Web Pages\v1.0\;C:\Program Files\Microsoft SQL Server\110\Tools\Binn\;C:\Program Files\MySQL\MySQL Server 5.6\bin;C:\Program Files (x86)\PHP\v5.3\libeay32.dll;C:\Program Files (x86)\PHP\v5.3\ssleay32.dll;C:\Program Files (x86)\Microsoft SQL Server\100\Tools\Binn\;C:\Program Files\Microsoft SQL Server\100\Tools\Binn\;C:\Program Files\Microsoft SQL Server\100\DTS\Binn\;C:\Program Files (x86)\Microsoft SQL Server\100\Tools\Binn\VSShell\Common7\IDE\;C:\Program Files (x86)\Microsoft Visual Studio 9.0\Common7\IDE\PrivateAssemblies\;C:\Program Files (x86)\Microsoft SQL Server\100\DTS\Binn\;%JAVA_HOME%\bin
打开注册表，查找oracle的相关服务项即可顺路删除相关的注册表项。
查找：OracleDBConsoleLLS
HKEY_LOCAL_MACHINE\SOFTWARE\ORACLE
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\services\eventlog\Application\Oracle.lls
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\services\eventlog\Application\Oracle.VSSWriter.ENDV
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\services\eventlog\Application\Oracle Services for MTS
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\services\eventlog\Application\Oracle BI Administration Tool
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\services\eventlog\Application\Oracle BI nQUDMLExec
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\services\eventlog\Application\Oracle BI Scheduler
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\services\eventlog\Application\Oracle BI Server
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\services\eventlog\Application\Oracle BI Utility
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\services\eventlog\Application\Oracle Services for MTS
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\services\eventlog\Application\Oracle.VSSWriter.ENDV
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\services\eventlog\Application\Oracle.VSSWriter.LLS
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\services\eventlog\Application\Oracle.VSSWriter.ORCL
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\services\eventlog\Application\OracleDBConsolells
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\services\eventlog\Application\OracleDBConsoleorcl
....
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\services\Oracle Data Provider for .NET
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\services\Oracle Data Provider for .NET
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\services\Oracle11
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\services\OracleDBConsoleLLS
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\services\OracleJobSchedulerLLS
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\services\OracleOraDb11g_home2ClrAgent
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\services\OracleOraDb11g_home2TNSListener
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\services\OracleServiceLLS
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\services\OracleVssWriterLLS
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet002\services\eventlog\Application\Oracle BI Administration Tool
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet002\services\eventlog\Application\Oracle BI nQUDMLExec
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet002\services\eventlog\Application\Oracle BI Scheduler
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet002\services\eventlog\Application\Oracle BI Server
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet002\services\eventlog\Application\Oracle BI Utility
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet002\services\eventlog\Application\Oracle Services for MTS
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet002\services\eventlog\Application\Oracle.endv
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet002\services\eventlog\Application\Oracle.lls
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet002\services\eventlog\Application\Oracle.VSSWriter.ENDV
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet002\services\eventlog\Application\Oracle.VSSWriter.LLS
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet002\services\eventlog\Application\Oracle.VSSWriter.ORCL
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet002\services\eventlog\Application\OracleDBConsolells
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet002\services\eventlog\Application\OracleDBConsoleorcl
最后，删除相关目录及程序的快捷方式。
D:\app
C:\Users\Administrator\AppData\LocalLow\Sun\Java\jre1.6.0_24\
重起计算机后即可全新安装oracle的相关软件，包括oracle数据库。
