How to uninstall Oracle 10g in Windows XP manually

note :  ”don’t forget to backup your previous oracle data.”

1. Stop any Oracle services that have been left running.
   Start->Settings->Control Panel->Services
   Look for any services with names starting with ‘Oracle’ and stop them.
2. Run regedit and delete the following keys (some may have slightly different names in your registry):
   HKEY_CURRENT_USER\SOFTWARE\ORACLE
   HKEY_LOCAL_MACHINE\SOFTWARE\ORACLE
   HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet Services\EventLog\Application\Oracle.oracle
   HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet Services\OracleDBConsole
   HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet Services\Oracle10g_home
   HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet Services\OraclService
   Note that the services control panel will still show the old services until you reboot.
3. Delete the Oracle home directory
   C:\Oracle
4. Delete the Oracle Program Files directory:
   C:\Program Files\Oracle
5. Delete the Oracle Start Menu shortcuts directory:
   C:\Documents and Settings\All Users\Start Menu\Programs\Oracle*
   Where * indicates the name of your install. Look for and remove all Oracle directories from that location.
6. Remove Oracle refereces from the path. To edit your path go to:
   Start->Settings->Control Panel->System->Advanced->Environment Variables
   Edit both of the environment variables user PATH and system PATH. Remove any Oracle references in them.
7. Remove Oracle.DataAccess and any Policy.Oracle files from the GAC which is at:
   C:\Windows\assembly\

* this article is copy paste from http://krsethur.wordpress.com

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~ by efuzie on April 8, 2010.