Do you want another surprise? I'm running Windows 7. lol. But, yeah... NWN runs on it. Beam Dog released an updated version of it a few years ago. It will work on all modern OS's. The new version (called Enhanced Edition--or "EE can run the old stuff. But, sadly, I can't run the EE stuff.)
It's been a loooooooooong time since I played NWN! But I came across the CDs in a box recently and decided to install it on my PC. At one time, I could design a complete module pretty fast. I gave the creator a try when I installed it. I'm a bit rusty to say the least. I just googled NWN vault. Surprisingly, they're still going.