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Core40.dll, Ordinal 435 Could not be found...

114023Nov 19 2002

I am getting the following error message when attempting to launch any Oracle Developer 6.0 application:
"The ordinal 435 could not be located in the dynamic link library CORE40.dll"

I have looked extensively on the web for the fix for this issue, but can find none. Please note that I also have Oracle 8.1.7 client installed on this computer. I am running the Windows XP Professional OS. I have tried the %PATH% environment variable fix as suggested, however I still receive the error. Here is my %PATH% variable content:
C:\Program Files\Notes5;C:\Program Files\Reflection;C:\Program Files\Notes5;%SystemRoot%\system32;%SystemRoot%;%SystemRoot%\System32\Wbem;%SystemRoot%\system32\nls;%SystemRoot%\system32\nls\ENGLISH;C:\Program Files\ORA95_2\BIN\;C:\Program Files\ORA95_2\OLAP\BIN;C:\Program Files\oracle\jre\1.1.7\bin;C:\oracle\ora81\bin

If anyone can help me, I would truly appreciate it. Thank you in advance.