Pl/SQL web application
IMHO the easiest way to get an OWA application to work is by installing a standard Apache distribution and the open source mod_owa.

This is easiest on modern 64bit Windows, downloading Apache 2.4 from http://www.apachelounge.com/download/ and mod_owa from https://oss.oracle.com/projects/mod_owa/dist/documentation/modowa.htm