It should work flawlessly with 32 bit version. I would go for 32 Ultimate or whatever it is. But the base really is Vista, it just looks slightly different. So yeah it should work fine. I bootcamped one of my mac laptops with Windows 7 pre-release and Gerber 3.0 I was able to get everything working.
So you should be okay, however as always approach with caution, Gerber is pretty picky about what they support and don't support. If it wasn't for my Edge I would move to flexi. But I need my Edge.
Mike