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Oracle uninstallation is not just uninstalling from Oracle Universal Installer. There are some more files to remove from different locations. Although you de-install the software from OUI still related files remain in your computer.
You first use oracle universal installer to de-install Oracle.
Click on the De-install Products button.
Now you can see it has been removed from program list.
Go to registers by typing ‘regedit’ in the run in the start menu.
Delete ‘HKEY_LOCAL_MACHINE/SOFTWARE/ORACLE’ key. This contains registry entries for all oracle product details.
Delete any reference to oracle in following paths in the registry.
HKEY_LOCAL_MACHINE/SYSTEM/CurrentControlSet/Services/Ora*
HKEY_LOCAL_MACHINE/SYSTEM/CurrentControlSet/Services/Application/Ora*
HKEY_CURRENT_USER/SOFTWARE/oracle
Control panel services still may show old services until you restart.
Delete oracle home directory. D:\oracle
Delete oracle directory from program files. C:\Program Files\Oracle
Delete any reference to oracle in following path
Start->Settings->Control Panel->System->Advanced->Environment Variables
Now oracle has been totally removed from your system.
