Hi Pugz
I've not been around much either .. especially since (as the GF is into WoW) I've finally .. after almost 2 years .. installed the WotLK expansion. Ah well!
Anyways!
One thing I have done when I've installed NWN (& SoU & HotU) is go to the NWN web site
http://nwn.bioware.comlogged in and gone to
http://nwn.bioware.com/my_account/edit.html..which you can browse to under the left menu through:
My Account
Edit My Account
Scroll down a bit and look on the right-hand side of the window, and you'll get to a link where you can (securely) upload your NWN (SoU, HotU) CD Keys.
Then if you lose your manuals (or wherever you had them originally) you can get your CD Keys back.
Maybe you did this years ago and had simply mislaid that memory??
Either way -- good luck out there
- Peter