How to completely uninstall oracle software?

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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.

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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

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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