Bad news is that FS2000 MUST HAVE DX7...but there is a later version DX7-a. That's the one to avoid. Unless you have puposely put it there it won't appear. FS2000 only puts in DX7.
BTW Steve what probs have you have with DX7...to date I have had no problems, whereas previously I got the occasional headache when playing multiplayer games with linked machines (I'm still not brave enough to install DX7a however based on all reports).