[CentOS-virt] Sound and VGA resolution for KVM guests

Hi all,

Recentlly, I have installed a Windows 7 Enterprise kvm guest under a CentOS 5.4 kvm host (fully updated) using virtio drivers and all works ok except two things: sound and vga resolution.

a) How can I increase vga resolution to 1440x900 or is not possible to configure more than 1024x768 when virt-manager is used??

b) I have assigned a sound device to this windows guest (ac97) but it doesn't works. Do I need to download this driver from some location?? Under hardware view windows shows me a multimedia device but without driver installed.

Thanks.