Window7 Oracle Uninstall Steps

To completely uninstall the oracle11g step:
1. Start-> Setup-> Control Panel-> Management Tool-> Service (or run services.msc) stop all Oracle services.
2. Start-> Program->oracle-oradb11g_home1->oracle Install product-> Universal Installer, click "Uninstall Product"-"Expand All" and select all directories except "oradb11g_home1" to delete. (There are cases where the deletion is not possible, it's OK, follow the steps below to manually continue to delete)
3. Run regedit,

Select Hkey_local_machine\software\oracle to delete this ORACLE folder.
Select HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services to remove all folder services starting with Oracle or Oraweb. --Service
Select Hkey_local_machine\system\currentcontrolset\services\eventlog\application to delete the Oracle folder. --Event Log

According to the situation, I did not handle the following three directories:
(delete all keys prefixed with Ora, Oracle, ORCL, or Enumora in the HKEY_CLASSES_ROOT directory.)
Delete Hkey_current_user\software\microsoft\windows\currentversion\explorer\menuorder\start Menu\ All keys in the programs that start with Oracle.
Delete Hkey_local_machine\software\odbc\odbcinst. INI In addition to the Microsoft ODBC for Oracle registry key, all the keys that contain Oracle.

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4. My Computer----high-level----environment variables, delete environment variables classpath and path for Oracle settings.
5. Remove all Oracle-related groups and icons from the desktop, startup Group, and Programs menu.

6. After restarting the computer, remove all Oracle-related directories including:

General Two directories:

1) C:\APP\Administrator\product\11.2.0\dbhome_1\ .... Entire Directory Delete

2) C:\Program Files (X86) \oracle\ ... Oracle Entire Directory Removal

Also refer to the following:
1.c:\program file\oracle directory.
2.oracle_base directory (the installation directory for ORACLE).
3.c:\windows\system32\config\systemprofile\oracle directory.
4.c:\users\administrator\oracle or C:\Documents and settings\administrator\oracle directories.
5.c:\windows Delete the following files Oracle.ini, Oradim73. INI, Oradim80. INI, Oraodbc.ini, and so on.
If there is a [ORACLE] tag segment in the Win.ini file under 6.c:\windows, delete the segment.
7. If necessary, delete all Oracle-related ODBC DSN
8, to the Event Viewer, delete the Oracle related log description: If there are individual DLL files can not be deleted, then ignore, restart, start a new installation, install, select a new directory, then, after installation and restart, the old directory and files can be deleted.

Window7 Oracle Uninstall Steps