If you want a speaking graphical interface to VirtualBox, you will need the qt-at-spi-git package from AUR installed on your system. Otherwise, you will need to setup the virtual machine using the command line interface. As for installing Windows 7 itself, I could be wrong, but I don't think it can be installed with speech output. Rumor has it that Windows 8 is supposed to fix this, but I haven't tried it, so can't help determining whether or not there is any truth to the rumor. ~Kyle