Uninstalling Oracle 10g Manually from Windows XP

List of additional steps to do for cleaning the system completely after uninstall using universal installer.
# 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.
# Run regedit and delete the following keys (some may have slightly different names in your registry):
HKEY_LOCAL_MACHINESYSTEMCurrentControlSet ServicesEventLogApplicationOracle.oracle
HKEY_LOCAL_MACHINESYSTEMCurrentControlSet ServicesOracleDBConsole
HKEY_LOCAL_MACHINESYSTEMCurrentControlSet ServicesOracle10g_home
HKEY_LOCAL_MACHINESYSTEMCurrentControlSet ServicesOraclService
Note that the services control panel will still show the old services until you reboot.
# Delete the Oracle home directory
# Delete the Oracle Program Files directory:
C:Program FilesOracle
# Delete the Oracle Start Menu shortcuts directory:
C:Documents and SettingsAll UsersStart MenuProgramsOracle*
Where * indicates the name of your install. Look for and remove all Oracle directories from that location.
# 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.
# Remove Oracle.DataAccess and any Polic.Oracle files from the GAC which is at:

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