How to completely uninstall oracle software?

Dear all,
I have followed the installation guide to delete the oracle software after i removing the CI and DB instance.
There was 2 parts where i unsure whether i did it correctly.
3. Edit the Oracle Registry entries as follows:
a. Choose Start → Run and enter REGEDIT
b. Delete the key HKEY_LOCAL_MACHINE → SOFTWARE → ORACLE
c. Delete all Oracle references under HKEY_LOCAL_MACHINE → SYSTEM→CURRENTCONTROLSET → SERVICES
4. Delete all Oracle references from the Windows user and system environment:
a. Choose Start → Programs → System.
b. Choose the Advanced tab and then click Environment Variables.
c. For example, delete the variables:
TNS_ADMIN, NLS_LANG, ORACLE_HOME
d. Also delete Oracle from the PATH variable
I was unsure because there are so many Sap system installed in the same host. I deleted everything with the <sapid> in the above place.
After i done with the deletion, i start to reinstall a new oracle software, whenever i start the OUI, the old oracle software keep generate out(i deleted manually and trying to install a new oracle software with the same name).
In the end, i gave up and use another name. why is this happening? maybe i didn't delete it clearly enough?
hope some one can explain on this, thanks in advanced
regards,
Jerry

This is where my problem comes. I have multiple SAP instances that are installed in the same host.
I deleted ALL the registry enteries and environment variables that contain the <sid> that i wanted to delete. Then i have problem starting back my other SAP instance(we have to close all the services and sqlplus when deleting the oracle software). I couldn't start the services back with error 6: invalid handler. I could not see any sap system from MMC.
I believe it have to do with the environment variable and registry entries i deleted. Any idea how to recover back or tell me what is the standard environment variable that is needed for multiple sap and oracle to run?
p/s: we have multiple oracle software and multiple sap instance/DB instance installed in the same machine.

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