FSX on Vista 64 works like a champ for me. I think for 32 bit you're far better off with XP, but for 64 bit, I'd give vista a shot. I also believe that if you get a retail (non OEM) version, you also get XP 64 if you want to "downgrade", which gives you options.A number of utilities for tweaking are now finally working for Vista (they are code signed).Life is good.Cheers,Etienne

Like I mentioned beforeFSInn IvApgives all kinds of weird problems with Vistax64when you're online flying on VATSIM or IVAOso do several addonns (like FollowMe)most addon developers do NOT test with x64FSX not on a network indeed is very fast (125-133%?) on x64P5K 4GB-DaneElec Q6600 8800GTS640MB XPproSP2 FSXSP2