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Client ADI is not certified with Windows 7
Is Client ADI Certified With Windows 7? ORA-6413: Connection Not Open For ADI On Windows 7 [ID 947580.1]
FAQ: Certification Information For Client ADI And Webadi [ID 1251224.1] -- Is Client ADI certified with Windows Vista or Windows 7?
Please try to restart the machine in Safe mode and try to complete this installation.
It worked for me.