Unfortunately once the mixing of the values occur this is difficult to fix. In order to completely remove the 7.3.4 entries you may need to remove the entire Oracle section. Of course this means backing up your Oracle database, then following notes 124353.1 or 208256.1 from Metalink to clean the registry, re-installing Oracle (if required) and restoring your database. I wish I had a better solution but to make sure that the contamination from the old install is completely removed, I can think of no other safe, supported method.
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