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%libextaccess-bridge-64.jar;%JAVA_HOME%libextjaccess.jar
.....
CLASSPATH=.;%JAVA_HOME%libdt.jar;%JAVA_HOME%lib ools.jar
PATH=D:appAdministratorproduct11.2.0dbhome_1in; C:Program FilesPHPv5.3;C:Program Files (x86)Internet Explorer;C:Program FilesCommon FilesVSL Utils;C:Windowssystem32;C:Windows;C:WindowsSystem32Wbem;C:WindowsSystem32WindowsPowerShellv1.0;C:Program FilesMicrosoftWeb Platform Installer;C:Program Files (x86)Microsoft ASP.NETASP.NET Web Pagesv1.0;C:Program FilesMicrosoft SQL Server110ToolsBinn;C:Program FilesMySQLMySQL Server 5.6in;C:Program Files (x86)PHPv5.3libeay32.dll;C:Program Files (x86)PHPv5.3ssleay32.dll;C:Program Files (x86)Microsoft SQL Server100ToolsBinn;C:Program FilesMicrosoft SQL Server100ToolsBinn;C:Program FilesMicrosoft SQL Server100DTSBinn;C:Program Files (x86)Microsoft SQL Server100ToolsBinnVSShellCommon7IDE;C:Program Files (x86)Microsoft Visual Studio 9.0Common7IDEPrivateAssemblies;C:Program Files (x86)Microsoft SQL Server100DTSBinn;%JAVA_HOME%in
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_MACHINESOFTWAREORACLE
HKEY_LOCAL_MACHINESYSTEMControlSet001serviceseventlogApplicationOracle.lls
HKEY_LOCAL_MACHINESYSTEMControlSet001serviceseventlogApplicationOracle.VSSWriter.ENDV
HKEY_LOCAL_MACHINESYSTEMControlSet001serviceseventlogApplicationOracle Services for MTS
HKEY_LOCAL_MACHINESYSTEMControlSet001serviceseventlogApplicationOracle BI Administration Tool
HKEY_LOCAL_MACHINESYSTEMControlSet001serviceseventlogApplicationOracle BI nQUDMLExec
HKEY_LOCAL_MACHINESYSTEMControlSet001serviceseventlogApplicationOracle BI Scheduler
HKEY_LOCAL_MACHINESYSTEMControlSet001serviceseventlogApplicationOracle BI Server
HKEY_LOCAL_MACHINESYSTEMControlSet001serviceseventlogApplicationOracle BI Utility
HKEY_LOCAL_MACHINESYSTEMControlSet001serviceseventlogApplicationOracle Services for MTS
HKEY_LOCAL_MACHINESYSTEMControlSet001serviceseventlogApplicationOracle.VSSWriter.ENDV
HKEY_LOCAL_MACHINESYSTEMControlSet001serviceseventlogApplicationOracle.VSSWriter.LLS
HKEY_LOCAL_MACHINESYSTEMControlSet001serviceseventlogApplicationOracle.VSSWriter.ORCL
HKEY_LOCAL_MACHINESYSTEMControlSet001serviceseventlogApplicationOracleDBConsolells
HKEY_LOCAL_MACHINESYSTEMControlSet001serviceseventlogApplicationOracleDBConsoleorcl
....
HKEY_LOCAL_MACHINESYSTEMControlSet001servicesOracle Data Provider for .NET
HKEY_LOCAL_MACHINESYSTEMControlSet001servicesOracle Data Provider for .NET
HKEY_LOCAL_MACHINESYSTEMControlSet001servicesOracle11
HKEY_LOCAL_MACHINESYSTEMControlSet001servicesOracleDBConsoleLLS
HKEY_LOCAL_MACHINESYSTEMControlSet001servicesOracleJobSchedulerLLS
HKEY_LOCAL_MACHINESYSTEMControlSet001servicesOracleOraDb11g_home2ClrAgent
HKEY_LOCAL_MACHINESYSTEMControlSet001servicesOracleOraDb11g_home2TNSListener
HKEY_LOCAL_MACHINESYSTEMControlSet001servicesOracleServiceLLS
HKEY_LOCAL_MACHINESYSTEMControlSet001servicesOracleVssWriterLLS
HKEY_LOCAL_MACHINESYSTEMControlSet002serviceseventlogApplicationOracle BI Administration Tool
HKEY_LOCAL_MACHINESYSTEMControlSet002serviceseventlogApplicationOracle BI nQUDMLExec
HKEY_LOCAL_MACHINESYSTEMControlSet002serviceseventlogApplicationOracle BI Scheduler
HKEY_LOCAL_MACHINESYSTEMControlSet002serviceseventlogApplicationOracle BI Server
HKEY_LOCAL_MACHINESYSTEMControlSet002serviceseventlogApplicationOracle BI Utility
HKEY_LOCAL_MACHINESYSTEMControlSet002serviceseventlogApplicationOracle Services for MTS
HKEY_LOCAL_MACHINESYSTEMControlSet002serviceseventlogApplicationOracle.endv
HKEY_LOCAL_MACHINESYSTEMControlSet002serviceseventlogApplicationOracle.lls
HKEY_LOCAL_MACHINESYSTEMControlSet002serviceseventlogApplicationOracle.VSSWriter.ENDV
HKEY_LOCAL_MACHINESYSTEMControlSet002serviceseventlogApplicationOracle.VSSWriter.LLS
HKEY_LOCAL_MACHINESYSTEMControlSet002serviceseventlogApplicationOracle.VSSWriter.ORCL
HKEY_LOCAL_MACHINESYSTEMControlSet002serviceseventlogApplicationOracleDBConsolells
HKEY_LOCAL_MACHINESYSTEMControlSet002serviceseventlogApplicationOracleDBConsoleorcl
最后，删除相关目录及程序的快捷方式。
D:app
C:UsersAdministratorAppDataLocalLowSunJavajre1.6.0_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。