Step 1: Stop all Oracle processes and the Distributed Transaction Coordinator service.
Step 2: Run regedit and delete the following entries:
HKEY_LOCAL_MACHINESOFTWAREORACLE HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServicesOracle* HKEY_LOCAL_MACHINESYSTEMControlSet001ServicesOracle* HKEY_LOCAL_MACHINESYSTEMControlSet003ServicesOracle*
Exit regedit, and then reboot.
Step 3:Delete the Oracle directory (x:oracleVIS12) and C:Program Filesoracle.
Empty the recycle bin, and then reboot the computer once more.
Step 4:Clean up the Program Menu for Oracle entries
Step 5:Run Rapid Wizard to restart the R12 installation.
Metalink Reference:
Doc ID: 567507.1 (How to Remove an Oracle E-Business Suite Release 12.x Windows Environment)
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