NOT WORKING FOR ME WITH PC-BSD 9.0 AND VIRTUALBOX 4.1.16: Installation from the Live-DVD under VirtualBox: Either click on the install icon using the Gnome desktop, or, if using KDE, go to /root/Desktop and run the installer (installpcbsd.desktop). However it produced an irrecoverable error at the last moment of the installation. The machine cannot be booted again.
WORKED: Downloaded and used the PC-BSD .vdi VirtualBox image.
Change Keyboard Layout: system Settings / Hardware / Input Devices / Keyboard / Layouts / Add (select the desired layout).
Install Java: Using AppCafe, search for "jdk", install.