Have you downloaded any version of the oracle database (oracle 10g, and recently 11g)?
I use the oracle 10g express edition installed on my local PC to connect to my database. you can download any version by first hooking up to the oracle.com website, register and then dowload and install the database (either 10g or 11g version) to your PC. do so and let the forum know what to do next. Hope this does something?