How to manually uninstall oracle 11G in Windows 7

1. Choose "start"> "Settings"> "Control Panel"> "Administrative Tools"> "services" to stop all Oracle services.
2. Start-> Program-> Oracle-OraHome81-> Oracle Installation Products-> Universal Installer uninstalls all Oracle Products, but the Universal Installer cannot be deleted.
5. Run regedit, select HKEY_LOCAL_MACHINE \ SOFTWARE \ ORACLE, and press del to delete the entry.
6. Run regedit and select HKEY_LOCAL_MACHINE \ SYSTEM \ CurrentControlSet \ Services. Scroll through the list and delete all Oracle entries.
7. Run regedit, HKEY_LOCAL_MACHINE \ SYSTEM \ CurrentControlSet \ Services \ Eventlog \ Application to delete all Oracle entries.
8. Choose "start"> "Settings"> "Control Panel"> "system"> "advanced"> "environment variable" to delete Oracle settings in the environment variables CLASSPATH and PATH.
9. Delete all groups and icons related to Oracle from the desktop, STARTUP group, and program menu.
10. Delete \ Program Files \ Oracle directory
11. restart the computer to completely delete the Oracle directory.
12. Delete Oracle-related files, select the default Oracle directory C: \ Oracle, delete the input directory and all subdirectories, and: \ Delete the following ORACLE files in WINDOWS. INI, oradim73.INI, oradim80.INI, oraodbc. ini and so on. 13. If the [ORACLE] Tag segment exists in the WIN. ini file, delete it.
14. If necessary, delete all Oracle-related ODBC DSN
15. Delete Oracle-related logs in Event Viewer: if some DLL files cannot be deleted, restart and start a new installation, select a new directory. After installation and restart, the old directory and files can be deleted.

Author: "Zuo Luo CTO"