Ok, so, i log on to NWN2, go to the multiplayer, and try to get on, but it prompts me to update, so i click ok. It takes me back to the updater, and it begins to update, but then gives me an error message, saying im missing something that is needed. I try to update about three more times, then i uninstalled the game. I then proceed to attempt to reinstall, and get to where the CD kkey needs to be inserted, which it now wont accept. It has accepted my cd key before, ive tried it with shift, without shift, with capps locks, and the letters are too clear for me to mistake a letter/number with another. Help, please...
Welcome to my bloody world...
(Although I refer more to NWN Deluxe Edition than NWN2...)
All I can suggest, is keep trying. It might work eventually, it might not. Have you tried manually deleting all registry entries?
I don't know how, and I don't know why, but this is totally Sheep's fault.
Are you using the Drive2drive edition?
Go into your NWN2 directory and see if there's a nwncdkey.ini. If there is one, delete it.