[Animayhem]

Some other things worth mentioning.

Check to see if you are set for 32bit or 64bit.
For some reason NWN defaults to 64 but will stay at 32 once you change it.

Also maybe reduce the graphic quality over all. Turn off things like shiny water or grass.

Sometimes instant messaging services or open browsers can cause it.
(Yea I know multitaskers may not want to hear that :P)

Check your firewall.