John, I'm doing the same search and coming up empty. Trying to install Win7
on Sony VGN-CR490, and upgrade advisor tells me a new driver for PCIxx12 is
available from manufacturer, but it's not! Could not find it on TI website
(which is as nightmarish as you describe) or on Sony site (which is unhelpful
as always) and have encountered your question on several forums, all with no
reply. What did you wind up doing?
We can't be the only Sony users who want to upgrade! If I find an answer I
will post it here.