bon les amis , j´ai réussi à faire marcher xcom apocalypse sous vista avec super son lol !!
et pour razordragon , y a le son ET la souris rapide
je précise je suis en mode fenétré !!
reste plus qu´à savoir comment agrandir cette fenetre lol
j´ai utilisé 2 outils
- dos box 7.0
- dosbox front end ( D-fend v3 béta ) qui facilite grandement l´utilisation de dos box !
de plus , sous vista si vous voulez installer depuis le cd vous aurez un message d´erreur " your system doesn´t support full screen " sic ...
pour contourner celà et lancer l´instal des fichiers sur disque dur , il vous faut mettre les drivers de VGA adaptater , une fois les fichiers copiés vous pourrez remettre vos derniers drivers ( pour ma part nvidia 8800 GTS )
des liens :
http://members.home.nl/mabus/dfend.htm
http://dosbox.sourceforge.net/news.php?show_news=1
voici la procédure en anglais ( désolé )
" Start the program
Just under File at the top left is a lill Wizards hat. klick it.
Name your profile something easy like Xcom Apoc or Apoc so you know its related to this game.
Under game exe you klick browse and find your way to your XCOMAPOC.EXE file in your apoc folder.
this is what mine looks like. C:\oldgames\XCOMA\XCOMAPOC.EXE
do the same under setup EXE exept insted of XCOMAPOC.EXE you brows to SETUP.EXE in your apocs folder. ok go to the next step.
you dont realy need to do anything here exept fiddle with Cycles alittle (might not be needed) the default is 3000 but i run at 12000 (if you whant to know what these do go to the dosbox homepadge)
press next.
Now to create the Drives. press add
under mounttype let it be at drive
under select drive/CDROM/image or floppy to mount, you brows to your C:\oldgames dir (or whatever folder you created) mine looks like this c:\oldgames
driver label set it to C (dont know if its needed or not but do it anyway)
and under mounted Driver Letter chose C.
Check the box that says Enable Input output controll.
Ok Press OK
type add again
Change mount type to CDROM
under select drive/CDROM/image or floppy to mount, you brows to your CD in my case E:\
Set label to E (not sure if needed once again)
and set Mounted Drive letter to E (or to the same as your cdrom if you dont have your cd on E 
Check the box that says Enable Input output controll.
Press OK.
Move to next step you can just skipp past all the sound setups just remember to keep your shoundblaster the same as dosbox and the game uses 220 7 1, I disabled speaker and disney sound btw. no need to unless you feal like it.
press next till D-fend says ALL DONE!!."
et voilà le résultat sous mon vista !!
http://img514.imageshack.us/img514/4633/capturerim6.jpg
donc pour ceux qui veulent passer sous vista et garder ufo defense et xcom apocalypse c´est faisable lolololol