Was this a clean install or an installation over the top of an existing version ?
I reported this resolution issue on the last couple of versions on my 1024X600 netbook.
This time round I installed over the top of an existing 9.0.2007 version, I chose a custom install and unchecked the chrome options right at the start. After unchecking the elements I didn't want and completing the installation I rebooted.
I didn't get the Complete avast software update screen this time round (on either system win7 and xp pro), so I didn't have a resolution issue. Nor did I have any chrome install, for those who are thinking if I hadn't unchecked the chrome options as I didn't get the screen. Looks like it is remembering my opt-out choice from the first screen.