Following are the Activities need to be done after Uninstalling Oracle, if not done u wont be able to install oracle again on the same machine. 1. Start-Run- Regedit Delete all Oracle related Folder from follo. Oracle
2. Go to System-Services Delete all oracle folders as follo.
3. Then Go to System-Current control set-Services-Eventlog Delete oracle related files
4. Then Go to Start-Setting- Control Panel- Admistrative Tools- ServicesSelect Oracle related services –left click –Stop.
Then restart the Machine and start to install Oracle again.