No-one carries new stock of an item 15 years old! - particularly one that is very possibly counterfeit in the first place, since OXP+FP was if I remember right, only issued as a Volume Licensed product.
Your only hopes if you really need the disk are either to find a download of the ISO file, or a copy on eBay - in either case you should be VERY careful about the presence of malware!
It may however simply be a case of a faulty setting somewhere - you should repost in the Office Community forums where you may be able to get help.
http://answers.microsoft.com/en-us/office/forum