I downloaded, unzipped and installed the 64-bit version of Oracle 11gR2 on my new Windows 7 Enterprise x64 laptop. I initially chose "server software only", Enterprise Edition. Then when the software finished installing, I ran Database Configuration Assistant to create the database.
Now I can connect to the database through SQL*Plus, but I can't connect to it through Net Manager or SQL Developer. Net Manager gives me a NO LISTENER error. SQL Developer gives me the error "the network adapter could not establish the connection".
I've never needed to create a listener before when I've installed Oracle on many 32-bit Windows XP and/or Windows 2003 Server R2 machines so I'm a little confused.
What could I be doing wrong?