Steps to completely uninstall Oracle 11g under Win7

1 Right-click on "Computer"--services and services and applications--Stop all Oracle-related services (Oracle-like ORACLEDBCONSOLEORCL).

2 Start-All Programs-->oracle-->oracle Install the product-->universal Installer, "Welcome" after you start, uninstall the product and expand Oradb11g_ in the Oracle home directory home1--> Check the Oracle Database 11g11.2.0.1.0--> Delete and select "Yes" in the pop-up confirmation window. When the uninstallation is complete, select Close in the Product List screen that pops up, and then select Cancel in the Welcome screen to exit the interface.

3 start à enter regedit in the search field to enter the registry

1) Select Hkey_local_machine\software\oracle, press del to delete this entry

2) Select HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services, scroll through this list, delete all Oracle portals (keys starting with Oracle)

3) Select Hkey_local_machine\system\currentcontrolset\services\eventlog\

Application, delete all Oracle portals.

4) Delete all keys prefixed with Ora or Oracle in the HKEY_CLASSES_ROOT directory.

4 My Computer----high-level----environment variables, removing the settings for Oracle in the environment variables classpath and path.

5 Delete all Oracle-related directories (if not deleted, restart the computer and then delete it) include:

1) C:\Program files\oracle directory.

2) Oracle's installation directory, such as D:\app

3) C:\WINDOWS\system32\config\systemprofile\Oracle directory.

4) c \ user \ user name \oracle

Steps to completely uninstall Oracle 11g under Win7