Long story short, Windows 7 won.
The laptop has an ATI Mobile Radion x1400 graphics card for which AMD won’t provide support. I really like NVidia’s unified driver architecture for this reason. It seems to me that I have never had a problem finding a driver for an NVidia card on any OS because they always support the card – even in a minimalistic fashion – with their drivers.
AMD leaves their mobile chipset support up to the hardware vendor, and won’t even provide a stock driver.
I highly doubt, after 2.5 years and two new operating systems, that Dell is actually going to post a driver for a card that only came in a $1500 laptop if you paid $300 to upgrade.
I’m still going to try out the 32 bit version and see how she flies. No point in making the switch if I can’t use my graphics card (or the 17” 1900x1200 LCD) that came with the ‘puter.