Strange, when I click Open Avast user interface from the avast tray icon, right click options, that is what I get. If you just click on the avast tray icon does the avastUI open at the Home page ?

You can see my system spec in my signature below my posts, so we are broadly similar in age of system, though my win XP Pro SP3, will have a lower system requirement namely RAM and I have 4GB.

What avast version were you running before this latest release ?

What other security based software do you have installed (firewall, anti-spyware, etc.) ?