I have a Sony Vaio VGN-AW190 that originally came with Vista Home 64bit. I installed Windows 7 (clean install) 64bit.
The problem is the special buttons are not working at all (eject, S1, S2, multimedia, AV Mode, onscreen display such as when you adjust volume or brightness), etc. I did install...
brightness adjustment
clean install
drivers
eject button
fn keys
key functions
multimedia
notebookutilities
onscreen display
sony vaio
vista home
volume control
windows 7