Очистка компа от Oracle.

Ну не удаляет uninstall его полностью. Поєтому ручками ...
Звиняйте на аглицком. Но там и без перевода понятно.

Ensure you are logged in as a user with Administrator privileges.
Using regedit (at the command prompt, type regedit), go to HKEY_LOCAL_MACHINE\SOFTWARE\ORACLE and delete the ORACLE key.
Delete HKEY_LOCAL_MACHINE\SOFTWARE\odbc.
Open HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services, and remove all keys under HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services that begin with ORACLE.
Open HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\EventLog\Application, and remove all keys under HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\EventLog\Application that begin with ORACLE.
Open HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\oracle.....
Close regedit.
From the Control Panel, open System.
If JRE was installed by Oracle, remove the %ORACLE_HOME%\BIN path and the JRE path. For example, you may see a path similar to this one: C: \ORACLE\ORA81\BIN;G: \Program Files\Oracle\jre\1.1.7\bin. Go to Start > Control Panel > System > Environment tab. Click on the system variable path and modify the path.
Delete Icons from : \Winnt\Profiles\All Users\Start Menu\Programs\Oracle - and : \Winnt\Profiles\All Users\Start Menu\Programs\Oracle Installation Products. Where is the previous HOME name.
Delete : \Program Files\Oracle (from the Windows NT Explorer or from the command prompt).
Reboot your computer.
Delete all ORACLE_BASE directories (You can find the Oracle homes listed in HKEY_LOCAL_MACHINE\SOFTWARE\ORACLE\ORACLE_HOMES).