Uninstalling Oracle Products on Windows 2000

1. Ensure that you are logged in as a user with Administrator privileges
   
2. If any Oracle services (their names always begin with "Oracle") are running, then stop them:
   
   
   
   1. Right-click My Computer > Manage > Services and Applications > Services
      
   2. Scroll down to the Oracle services
      
   3. For each service with status "Started", select the service and click Stop
      
   
   
   

   
   
   

3. Use the Oracle Installer to uninstall the software:
   
   
   
   1. Click Start > Oracle - <home> > Oracle Installation Products > Universal Installer
      
   2. Click Installed Products
      
   3. For each product, expand the Oracle home you want to uninstall, select the product, click Remove, and then click Yes
      
   4. Exit the Installer
      
   
   
   

   
   
   

4. Start the registry editor: Click Start > Run > type regedit and press Enter
   
5. Note the value of the key HKEY_LOCAL_MACHINE\SOFTWARE\ORACLE\inst_loc (probably "C:\Program Files\Oracle\Inventory")
   
6. Delete the key HKEY_LOCAL_MACHINE\SOFTWARE\ORACLE
   
7. Delete all keys under HKEY_LOCAL_MACHINE\SOFTWARE\ODBC that are related with the "Oracle ODBC Driver"
   
8. Delete all keys under HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall that are related to Oracle
   
9. Delete all keys under HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services that begin with ORACLE or ORAWEB
   
10. Delete all keys under HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\EventLog\Application that begin with ORACLE
    
11. Delete all keys under HKEY_CLASSES_ROOT that begin with Ora or ORCL (e.g. Oracle*, ORADC*, ORAMMC*, OraOLE*, OraPerf*, and ORCL*)
    
12. Delete all keys under HKEY_LOCAL_MACHINE\SOFTWARE\Classes that begin with Ora or ORCL (e.g. Oracle*, ORADC*, ORAMMC*, OraOLE*, OraPerf*, and ORCL*)
    
13. Delete the key HKEY_CURRENT_USER\Software\Oracle
    
14. Delete all keys that match the pattern HKEY_USERS\*\Software\Oracle
    
15. Close the registry
    
    

    
    
    

16. Clean the environment:
    
    
    
    1. Click Start > Settings > Control Panel > System > Advanced tab > Environment variables
       
    2. Edit the PATH variable in the System Variables section:
       
       
       
       • Remove all references to Oracle homes (e.g. d:\ora904mt)
         
       • If JRE was installed by Oracle, then remove the JRE path
         
       
       
    3. If there is a CLASSPATH variable in the System Variables section, then note its value and then delete it
       
    4. If there are any other Oracle variables in the System Variables section (e.g. ORACLE_HOME, ORACLE_SID, TNS_ADMIN, JSERV, or WV_GATEWAY_CFG), then delete them
       
    5. Click OK and then OK again to close the System Properties box
       
    6. Close the Control Panel
       
    
    
    

    
    
    

17. Remove remaining folders and icons:
    
    
    
    1. Right-click Start and select Explore
       
    2. Navigate to C:\Documents and Settings\All Users\Start Menu\Programs
       
    3. Delete the folders that begin with Oracle
       
    4. Delete the folder whose name was pointed to by HKEY_LOCAL_MACHINE\SOFTWARE\ORACLE\inst_loc
       
    5. Close the Explorer window
       
    
    
    

    
    
    

18. Delete all folders and files in the C:\Documents and Settings\<username>\Local Settings\Temp\ directory
    
19. Delete the Oracle home directories
    
20. Right-click Recycle Bin, select Empty Recycle Bin, and click Yes
    
    

    
    
    

21. Defragment you disk:
    
    
    
    1. Right-click My Computer > Manage > Storage > Disk Defragmenter
       
    2. For each drive, select it and click Defragment
       
    
    
    

    
    
    

22. Reboot the computer