I'm also using Vista 32 (Home Premium) with no problems running in OpenGL.
I get the distinct feeling that users are going to have problems with OpenGL drivers if they are using graphics cards that are either Intel or ATI based -- ATI based cards have always had driver problems for just about everything and Intel cards, while perfectly fine for basic home use and business applications, really don't provide the power needed for any sort of gaming. The drivers are also very basic and they use the default Win32 drivers.
nVidia drivers seem to have their own implementation of OpenGL built into the main drivers which may explain why I've not had any graphics problems with DirectX or OpenGL.
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