At the *The "Available Product Components" screen, uncheck the Oracle Apache server option so that it does not get installed. With the new Apache security exploit, you almost certainly don't want to run the one that was bundled in when Oracle put together their 8.1.7 distribution.

If the Oracle installer let you recover gracefully from the Apache initialization failure, you can probably use the Oracle Installer to have it un-install the Apache version it was trying to give you.