this is from 9.1 guide, might be useful, dunno..
Manual Cleanup of a Deinstalled Oracle Database:
If the deinstallation of the OEE database fails for some reason, you need to perform the
manual steps in this procedure to completely remove the old installation before
reinstalling the database.
1. Deinstall the Standalone Client.
Be sure the Standalone Client is deinstalled before attempting to deinstall the
database. This should ensure that no EnterpriseOne tablespaces are imported
(attached) to the EnterpriseOne database.
2. Delete the following registry keys:
\HKEY_LOCAL_MACHINE\SOFTWARE\ORACLE\KEY_E1Local
\HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\ORACLE\KEY_E1Local
\HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\(see Keys below)
Keys. Delete any keys with names that start with "Oracle" and contain "E1Local".
3. Delete this directory:
c:\Oracle\E1Local
If you cannot delete the E1Local subdirectory because a file in that directory is
locked, follow these steps:
a. Determine which file is locked and which process has the lock on the file. A
freeware program called Process Explorer can be helpful in determining this
information. You can obtain a free copy of Process Explorer from this web site:
http://technet.microsoft.com/en-us/sysinternals
b. Either kill the locking process with Process Explorer or Microsoft Windows
Task Manager or, if the process was started as a Microsoft Windows service,
change the Startup Type to Manual and reboot the computer again.
c. Try again to delete the E1Local subdirectory.
4. Remove the 64-bit Oracle inventory entries.
a. With a text editor (such as Notepad), edit this file:
c:\Program Files\Oracle\inventory\ContentsXML\inventory.xml
b. Delete any lines that start with:
<HOME NAME="E1Local"
c. Save the file.B-2 JD Edwards EnterpriseOne Standalone Client Installation
5. Remove the entry from the Windows PATH.
a. Navigate to Control Panel > System.
b. Click Advanced system settings on the left.
c. Click Environment Variables… near the bottom.
d. In the System variables box near the bottom, highlight Path and click the
Edit… button.
e. In the Variable value field, delete this value:
c:\Oracle\E1Local\bin
Be sure to remove the semicolon as well.
f. Click OK.
6. Remove the ORACLE_HOME Windows environment variable.
a. Navigate to Control Panel > System.
b. Click Advanced system settings on the left.
c. Click Environment Variables… near the bottom.
d. In the System variables box near the bottom, highlight ORACLE_HOME and
click Delete.
e. Click OK
