you wouldn't happen to be running windows XP or 2000 would you? in that case (or even with windows 98/ME actually) 128MB of ram are not really enough for a game like NWN.
also, the 64 MB graphics isn't saying much. that could be either the high-end gf4 ti4200 or the aging gf2 mx400, or even the outdated voodoo5.
another thing that comes to mind - maybe, just maybe, you might be running on a via apollo pro 133 chipset (note the apollo pro 133A is a totally different story), which is, plainly put, crap, and certainly can't handle the modern games.
a very general advice would be to just turn the details and resolution all the way down and see if that helps.
and also the obvious - be sure to update ALL relevant drivers for your system - graphics, sound, motherboard...
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