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how to Completely remove Oracle 11g from my computer?

I have Windows7 64-bit.

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To remove it completely, take your hard disk, open it up, remove the platters, incinerate them, and disperse the ashes. If you don't need to be quite that complete, then perhaps you could tell us why you want to remove it "completely". – Mike Scott Mar 12 '11 at 19:19
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From Manual and Clean Uninstall Oracle for Windows :

  1. Uninstall all Oracle components using the Oracle Universal Installer (OUI).
  2. Delete the HKEY_LOCAL_MACHINE/SOFTWARE/ORACLE key which contains registry entries for all Oracle products by using regedit.
  3. Delete any references to Oracle services/components in the following registry location: HKEY_LOCAL_MACHINE/SYSTEM/CurrentControlSet/Services/. Looks for key entries that starts with “Ora” which are obviously related to Oracle.
  4. Reboot the workstation.
  5. Delete the ORACLE_BASE directory. (i.e C:\Oracle)
  6. Delete the C:\Program Files\Oracle directory.
  7. Empty the temp directory.
  8. Empty the recycle bin.
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  1. Remove any oracle entries in the PATH variable under Computer =>Properties => Advanced System Settings => Environment Variaiable => PATH
  2. In the same place remove the ORACLE_HOME entry
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