Hi, I am Suresh Mopada. Please find below the answer.
goto oracle UniversalInstaller and uninstall oracle properly. if you don’t find it in your system, just click on the same setup file and remove.
if you are not able to remove oracle from the above workaround. please follow below steps to remove OracleServiceXE.
Try to delete the service using the command prompt:
1. Click Start, type ‘cmd’ in the search field, and when ‘cmd’ shows up in the list of options, right click it and select ‘Run as Administrator’.
2. At the Command Prompt window, type “sc delete OracleServiceXE” without the quotes and press Enter.
3. Type “Exit” and press Enter.
Hope it helps.
C:\> sc stop OracleServiceXE (to Stop service)
C:\> sc delete OracleServiceXE (to remove)