Right click the avast 'a' icon, select about avast that will give you the full information.
What you are doing is just getting a localised information about the Simple User Interface, when the ? question mark is there click on a part of the interface and it should give brief info on it.
If you downloaded it yesterday from avast.com (?) then it is probably the 4.8.1201 version.
So what other security software do you have installed ?
Though if no change has happened from your previous installations that should be an issue, but worth checking.