Your system specs are similar to mine, except that I have 256 MB RAM and a TNT2 Ultra instead of a GeForce card.
My guess would be the video drivers or DX8. I use DX 7 and I have no problems.
But I'm not a techie so what do I know?
Any error messages? Or just a clean CTD? Have you tired bypassing the intro movies by hitting the esc key? Or disabling the movies by modifying the ini file?
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"Butt-kicking for goodness!" - Minsc
