I've just installed Oracle Database Express 11g. I confess it is on a Windows 8 64bit Microsoft Surface Pro. And I know that 64bit is not supported. I was able to find some instructions on getting 64bit installed and it "seems" to work.
However I am not having trouble opening the shortcut for 11g (ie. the 127.0.0.1:8080/apex/f?p=4950 link). Firefox is unable to establish a connection to the page.
If I then go and START DATABASE I seem to fine. I can then use the shortcut for 11g.
So it appears to me that perhaps the START DATABASE should run at startup (restart, reboot) but it is not.