1. Start-> Settings-> Control Panel-> Management Tool-> Service stop all Oracle services.
2. Start-> Program->oracle-orahome81->oracle installation products-> Universal Installer Uninstall all Oracle products, but Universal Installer itself cannot be deleted
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.
7. Run refedit,hkey_local_machine\system\currentcontrolset\services\eventlog\application and delete all Oracle portals.
8. Start-> Settings-> Control Panel-> System-> Advanced-> Environment Variables Delete environment variables classpath and path for Oracle settings
9. Remove all Oracle-related groups and icons from the desktop, Startup group, program menu
10. Delete \program Files\oracle Directory
11. Restart the computer to completely remove the Oracle directory after restarting
12, delete the files related to Oracle, select the default directory where Oracle is located C:\Oracle, delete this entry directory and all subdirectories, and remove the following files from C:\WINDOWS Oracle.ini, Oradim73. INI, Oradim80. INI, Oraodbc.ini, and so on. 13, WIN. INI file if there is a [ORACLE] tag segment, 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.
Troubleshoot the Oracle install times error "SID is already in use" approach
