OriginalTorchic: Thank you so much. Support has contacted me and the issue has been resolved. @wolfsrain my problem was that there wasn't anything in the description to let me know that the game no longer functioned as originally intended. Had I known that GameSpy was no longer in service and I would need to download third-party software to enable the server browser, I wouldn't have bought it. Now, I take responsibility in that I *could* have done some additional research prior to my purchase, but I didn't.
Again, thank you all for your assistance.
Glad to see your issue got resolved quickly. Just a note that the D&D games, in particular Neverwinter Night series and Planescape Torment are very popular top sellers here on GOG, and they very regularly come on sale at least 2 times a year if not 3-4 times a year for about 80% discount. All the D&D games can be bought for around $2 USD each during these promotions, and often all the D&D games are on sale in a mega-bundle for $21 or so for about 10 games. Now that the Baldur's Gate Enhanced Editions are swallowing up the availability of the original games it is not clear how this will play out in future D&D promo sales, but I presume that the NWN games at least will still be around $2 or so on sale. Even though it wont bring back Gamespy multiplayer, it might be worth considering vacuuming up the D&D collection here when one of the blowout promo sales is on, they're all great games to have a nice DRM-free copy of. :)
What would be awesome though, would be if because GOG is such a big D&D fanclub... if the publisher would add Galaxy multiplayer support to these titles that lost their multiplayer. Well, one can dream anyway. :P
Anyhow, good to see your issue is resolved, and hopefully GOG will update the game page with clearer info about the multiplayer issues.