Completely uninstall Oracle 11g

To completely uninstall the oracle11g step:
1. Start-> Settings-> Control Panel-> Management Tool-> Service stop all Oracle services.
2, Start-> Program->oracle-orahome81->oracle installation products-> Universal Installer, click "Uninstall Product"-"Expand All", select except "Oradb11g_ Home1 "All directories outside, delete.
5. Run regedit, select Hkey_local_machine\software\oracle, and press Del to delete this entry.
6. Run regedit, select HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services, scroll through this list, and delete all Oracle portals (keys starting with Oracle or Oraweb).
7. Run refedit,hkey_local_machine\system\currentcontrolset\services\eventlog\application and delete all Oracle portals.
8. Delete all keys prefixed with Ora, Oracle, ORCL or Enumora in the HKEY_CLASSES_ROOT directory.
9. Delete Hkey_current_user\software\microsoft\windows\currentversion\explorer\menuorder\start Menu\ All keys in the programs that start with Oracle.
10, delete hkey_local_machine\software\odbc\odbcinst. INI In addition to the Microsoft ODBC for Oracle registry key, all the keys that contain Oracle.
11. My Computer----high-level----environment variables, delete environment variables classpath and path for Oracle settings.
12. Remove all Oracle-related groups and icons from the desktop, startup Group, and Programs menu.
13. Delete all Oracle-related directories (if not deleted, restart the computer and then delete it) include:
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.
14. If necessary, delete all Oracle-related ODBC DSN
15, 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.