Oracle 11g installation failed with following error.
file not found D:\app\product\11.2.0\dbhome_1\ oc4j\j2ee\oc4j_applications\ applications\em.ear
There should be 2 zip files for Oracle installation.
Download and unzip both the files before starting the installation. Save both files in single directory and unzip it. The unzip will happen to ‘database’ directory.
Now you can start with the installation. This will resolve your issue.