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VirtualBox was installed.

You need to load the vboxdrv kernel module via /boot/loader.conf:

vboxdrv_load="YES"

For bridged networking please add the following line to your /etc/rc.conf:

vboxnet_enable="YES"

Reboot the machine to load the needed kernel modules.

You also have to add all users to your vboxusers group in order to use vbox.

% pw groupmod vboxusers -m jerry

Running VirtualBox as non-root user may fail with a fatal error 
NS_ERROR_FACTORY_NOT_REGISTERED. In this case delete /tmp/.vbox-*-ipc file.

Check wiki page for known issues and troubleshooting:
http://wiki.freebsd.org/VirtualBox

Please report any problems to emulation@. Thanks!

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