How to uninstall oracle in Three Windows Versions

When oracle is uninstalled, it cannot be deleted. I want to reinstall the system. In my work, I have summarized the following methods and hope to help you.

1. log on to Windows as an Administrators Group.

2. Uninstall all orcle products and components through Oracle installer.

3. Stop the Oracle service.

4. Delete the Oracle files under % oracle_base % and system_drive: \ Program Files.

5. Delete system_drive: \ Documents ents and Settings \ All Users \ Start Menu \Program.

6. Open the registry:

Under hkey_classes_root, Delete keys starting with Oracle, ora, or orcl;

Under HKEY_LOCAL_MACHINE \ Software, delete the Oracle key and the Apache Group Key;

Go to HKEY_LOCAL_MACHINE \ SYSTEM \ CurrentControlSet \ Services and Delete keys starting with Oracle;

Delete keys starting with Oracle under HKEY_LOCAL_MACHINE \ SYSTEM \ CurrentControlSet \ Services \ Eventlog \ application;

Under HKEY_CURRENT_USER, delete the Oracle key;

Under HKEY_CURRENT_USER \ Software \ oracle, delete the key that begins with Oracle or orcl (if any); close the registry and restart the computer.

7. Open the system environment variable (my computer-> right-click-> system properties-> advanced-> environment variable) and delete all items starting with % ORACLE_HOME % in path.

8. restart the computer.