Giomgr.exe - initialization of DLL %ORACLE_HOME\bin\oranro8.dll failed. The

Error Message

After upgrading from Oracle 8.1.5 to 8.1.6, and deleting SDE 8.01 and installing 8.02, starting SDE service yields this error:Giomgr.exe - initialization of DLL E:\oracle\ora81\bin\oranro8.dll failed. The process is terminating abnormally.

Cause

This appears to be caused by a known Oracle issue (#1233351). The file oci.dll is not overwritten during an upgrade from 8.1.5 to 8.1.6.

Solution or Workaround

Warning:
WARNING: The instructions below include making changes to essential parts of your operating system. It is recommended that you backup your operating system and files, including the registry, before proceeding. Consult with a qualified computer systems professional, if necessary. 

ESRI cannot guarantee results from incorrect modifications while following these instructions. Therefore, use caution and proceed at your own risk.