Hi Matthew,
For a Windows keyboard, I believe it is as follows:
CTRL is is CTRL
Start key is Command or Apple key
Alt key is Option
VO keys is CTRL+option. Use the VO keys in conjunction with left and
right arrows to navigate through the installer and VO keys+space to
activate a button.
Use cmd+f5 to start VO right after the DVD stops spinning for the
first time or listen for the audible message which tells you about
using VoiceOver if you're in need of it. In fact, you can press cmd
+f5 just about anytime after that and VO will work for you.
Hope this was what you were looking for.
Later...
Tim Kilburn
& Carter the Canine
Fort McMurray, AB Canada