Vista workaround for display driver???

Hi, I'm messing with trying to install Vista Basic on my pent 4 desktop. I ran it through the vista compatibility test and the it came back ok with only a message that the EliteGroup Computer System_AG305-32M (Sis) will not function with vista. I have been unable to find any newer drivers for it. Is there any way I can work around it to install? I've tried to install a couple times and each time after the first boot it comes up to just a blank dark gray screen, nothing.:confused I have unplugged all devices except mouse,keyboard, all devices in system info have no !'s and I ran windows update prior too. Any ideas?