mes avis qu'une mame cab est la meilleur raison pour éviter de mêtre vista , le temps que les jeux émulé direct x 10 sortent, de l'eau aura coulé sous les ponts 
vista peut aussi fonctionner en directX 9 hein...
sinon voici ce qui est indiqué sur le site d'ultimarc :
Windows Vista 32 Install.
The AGP card does not have WDDM Vista drivers, but you can use the XP drivers by following the "forcing a driver install" procedure, below.
Forcing a Windows Driver Install.
This procedure may be necessary if the driver does not appear to install for any reason.
From Control Panel, click "System", "Hardware", "Device Manager".
Open up the Display entry and right-click the entry "Ultimarc ArcadeVGA". Select "Update Driver".
Select "No, not this time", for searching the web for drivers.
Select "Install from a list or specific location".
Select "Don't search, I will select the driver to install"
Select "Have Disk"
A file open dialog will be displayed. Navigate to the location of the INF file on the Ultimarc CD as follows (assuming D is your CD drive)
Windows XP and 2K: D:/AVGAdrivers/XP/2KXP_inf
A list of available drivers will be displayed, select "Ultimarc ArcadeVGA".
Complete the install process. Do not choose to reboot at this time.
Repeat the above steps but this time, instead of right-clicking "ArcadeVGA" in Device Manager, select "Radeon Secondary". Reboot when complete.
Ignore any warning about the driver not having been tested with your hardware
