OK here is my Test results
Test systems
1 Desktop computer / vista 32 bit / nvida 8800 GT / NWN installed from each disk as they came out / critical rebuild ran
1 Laptop / Windows Xp 32 bit / 7900 gtx mobile / NWN installed with each disk / critical rebuild ran
1 Laptop / Windows 7 64 bit / amd HD 24000 / GOG install / No critical rebuild
1 Laptop / Windows 7 64 bit / Geforce 460M Nvidia / GOG install / No critical rebuild
2 Laptop / Windows 7 64 bit / Geforce 260M Nvidia / Diamond edition / critical rebuild ran
Desktop crashes even with rebuild
Laptop with xp and old installs crashes
GOG Laptops does not crash (seem to run smother)
Diamond editions Laptops does not crash (seem to run slower though)
My conclusions seem to point to real old installs have this error even with critical rebuild, but could be a vista or xp issue. I will give results after new installs. I do have the nwn complete but I used them to get NWN2 on these systems. I will do a reinstall on the crashing systems with one of these and report back if this fix the crash isssue. If it does not I will try a GOG reinstall and report on that.
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If you want any more specific information let me know.