Contact Adobe Support if you have a specific question about the Flash Player.
http://www.adobe.com/support/flashplayer/
As for getting full screen capability, that is dependent on the Driver for your ATI 7500.
http://www.driverheaven.net/mobility-radeon-drivers-support/136015-ati-mobility-radeon-7500-driver-vista.html
Are you trying to get full screen resolution for your Desktop or are you trying to do something with the Flash Player?
thanks