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I assumed add remove would leave bits behind, its been a long time since I was on the red team (9700Pro)
Yeah it may leave some registry entries and some nVidia folders but will not affect anything. At the end of the day you could leave the nVidia drivers there and just install the ATi drivers and away you go, your OS would just not see anything that uses the old drivers anymore and point the new hardware at the ATi drivers.
You could just uninstall from programs and features but many people like to use a driver tool like Driver Sweeper
+1 on using Driver Sweeper.
I currently have a gtx280 sli setup and will be replacing them with a 5870. Whats the best way to get rid of all traces of these drivers on Windows 7 64 bit?