Win32_VideoController returns NULL for Object on Windows XP sp 2.2 and 3.3

Running WMI queries on XP, both sp 2.2 and sp 3.3 I get NULL the object set from SELECT * FROM Win32_VideoController. the article at says this is a supported class for XP. I would appreciate any suggestions on how to start troubleshooting this problem. The offending code is c++.
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I usually try Win32_VideoController first... and if that doesn't work, then I try Win32_VideoConfiguration.   I believe the problem lies with the Video Card Vendor and not Microsoft... as the WMI class "provider" is usally supplied by the video card vendor.

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