I would actually use driver cleaner first to remove the old one and try to install 71.84 again.
http://www.nvidia.com/object/winxp-2k_archive.html' ">http://www.nvidia.com/object/winxp-2k_archive.html
Thats the Nvidia XP driver archive.
those grey trees you talk about might not be fixed. My parents 2001 dell came with that card, what a piece of junk. its hard to run any program on that card. I prefer the Radeon 8500 series over that one.
you might want to replace the vid card.
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