If the installation is on a PC with an Intel Pentium 4, perform the following steps:
Create a temporary directory on the PC.
Copy the entire contents of the Oracle RDBMS Server CD to the temporary directory created in the previous step.
Search the directory structure created in the first step for the existence of the filename symcjit.dll.
Rename each copy of the symcjit.dll to symcjit.old.
Run the setup.exe from the install\win32 directory (under the directory created in Step 1).
For further details, refer to Oracle MetaLink Note 131299.1