I've never changed chipset before without doing a fresh install of windows, might give it a go this time though and just see what happens as I'll be reinstalling windows again when Win7 comes out anyway. Normally I wouldn't bother but I'm sure I can struggle by with a flakey install for a month or so assuming it will actually boot into windows.
What's the best approach, uninstall chipset drivers before shutting down existing system (currently on NForce 650i Ultra chipset)?