Yes, I have been able to install AVG 9 but I have turned off a few of the optional features as suggested by someone on google groups when I had some issues with IE and DEP and also since my emails from Outlook had got a performance mess up. Things look better now.

Reference to the google groups post according to which I disabled the email scan options + active surfing shield, linkscanner, toolbar : http://groups.google.com/group/micro...ea8bef0c9eb080

So far it has been working good for me. I don't have the firewall from AVG as well, I am using the windows firewall with Vista.