I am a CTO with over 5 years of experience in start-up and over 10 years in working at managing position for big companies. I am also a full-stacks developer with over 12 years in system design, product development and technology product deployment.
User experience and system security are the things I care about most.
Open CurrentControlSet folder within the System folder
Open Services
Delete all keys related to Oracle. Every key starts with “ORA..”
Close the regedit
Delete ORACLE_HOME folder
Delete the Oracle folder in Program Files
Reboot
Uninstall all Oracle components using the Oracle Universal Installer (OUI).
Delete the HKEY_LOCAL_MACHINE/SOFTWARE/ORACLE (and HKEY_LOCAL_MACHINESOFTWAREWow6432NodeORACLE on 64bit) key which contains registry entries for all Oracle products by using regedit.
Delete any references to Oracle services/components in the following registry location: HKEY_LOCAL_MACHINE/SYSTEM/CurrentControlSet/Services/. Looks for key entries that starts with “Ora” which are obviously related to Oracle.