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OraOleDB not registered when installed via ODACXcopy on Windows7 64bit

I installed Oracle Instant Client and OraOLEDB on a Windows7 64bit machine by using OracleODACXcopy - but I've not been able to make OraOLEDB working.
It took a while to me to figure out that the reason is that the following statement (included in the called configure.bat file):
regsvr32 /s "%BAT_DIR%bin\OraOLEDB11.dll"
fails with the error:
+"The module "c:\oracle\bin\OraOLEDB11.dll" has been loaded, but the call to DllRegisterServer failed. Error code 0x8002801c."+

This affects the ODAC Xcopy version package only - the ODAC Oracle Universal Installer version works fine - but I was willing to provide customers with a easy batch process.

Any idea on possible reasons/workarounds?
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