Help !. View cycle issues in FS(

Hi allI have recently bought a new PC which I have just got up and running, my new system is this.Athlon Quad Core 9850 processorNVidia 9600GT gfx card4gb memoryWindows Vista 64bit.Latest Nvidia Gfx card driversFresh install of FS9Basically when I switch views in full screen mode using the usual S key it works great. But when I ALT ENT to run in a window and then cycle the view with the S key it doesn't work, it basically stays as the cockpit and it attempts to cycle the outside view which it does very poorly. I have re-installed FS9 but it's the same. I am thinking it's purely a Vista 64bit issue.Any ideas please?RgdsDean