I have just encountered the same virus/trojan

it brings up a window that says something like “xp 2012 unregistered version” and sticks to windows security icons in the task bar and warns that my firewall is off (which it isn’t)

my question is why, when I have Avast running and updated, does this get through when hippo can find it?

(if it can I’m running it on my pc right now)