1. References:
Http://archive.cnblogs.com/a/1520906/
Http://blog.oracle.com.cn/html/07/t-86007.html
Http://feng10251225.blog.163.com/blog/static/6312279820089154288377/
Http://space.itpub.net/12330444/viewspace-620190
Http://topic.csdn.net/t/20040511/08/3052489.html
2. Steps
Implementation Method:
1. Choose "start"> "Settings"> "Control Panel"> "Administrative Tools"> "services" to stop all Oracle services.
2. Start-> Program -> Oracle-orahome9i-> Oracle Installation products-> universal installer uninstalls all Oracle products, but the universal installer itself 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 refedit, 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. c: \ Program Files \ oracle directory
11. restart the computer to completely delete the Oracle installation directory, such as D: \ app \ oracle.
12. Delete Oracle-related files, select the default Oracle directory c: \ oracle, delete the entry directory and all subdirectories, and run the Windows 2000 directory (generally C: \ WINNT) to delete the following file oracle. 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. In Event Viewer, delete Oracle-related logs.
Note:
If some DLL files cannot be deleted, You can restart and start a new installation,
During installation, select a new directory. After the installation is completed and restarted, the old directory and files can be deleted.