Issue with a game

[Taem]

A few years back, I bought Neverwinter Nights Gold and the Hordes of the Underdark expansion. I never did play the game much so it sat on my shelves collecting dust until my neighbor asked me to borrow it. I did so but the game would not run on his computer (his video card wasn't any good) so he returned the game to me (or so he says). That was about a year ago, but recently my wife got a new computer for herself and expressed interest in playing this series. We tried installing it only to find the Hordes of the Underdark expansion CD missing! I told my neighbor of this fact who rebutted with his insistence he gave it all back to me, but I definitely do not have it. I have the book with the valid CD-Key in it, the package, everything but the darn CD. I went to Biowares website expecting a downloadable version requiring a CD-Key for activation, but nope, none exists there. I even went so far as to download an ISO of the CD from bittorrent only to find it was trojaned. I'm so frustrated because I don't want to purchase something I already bought, not to mention I can't even find that game in stores - only on eBay and similar websites.

Any suggestions? Perhaps Bioware will honor my purchase if I send them those bar codes on the box? I mean, I don't want a "crack" or anything like that. I legitimately purchased this CD and have the CD-Key, I just need the darn CD:(. Grrr...

EDIT: Alright, thinking aloud here; assuming I use the ISO I downloaded and mounted it, immediately Norton would kick in telling me there was a trojan and would remove it, then prompt me to reboot, but if I don't reboot and instead install the game, and then reboot, would that be bad? Would I end up infecting my computer? Would the game even work or would the data be corrupt? Doesn't really seem worth the risk. I think I'll try contacting Bioware first before I do anything and see what they say.