Avast Free unresponsive & frozen when viewing settings

[REDACTED]

Downloaded 11.1.2245 today and found when I open the avast UI, particularly the settings screen, within a minute Avast freezes on screen and is totally unresponsive. You can't minimize, move or close the avast UI, it remains on screen and requires a hard shutdown to reset the condition. CPU in this state remains at 100% constantly.
Running Vista Home Edition using avast definition file 151208-4
This is the first issue I've had in many years using this product. Any thoughts or similarities with anyone?

[Eddy]

Reboot 2-3 times and see if it makes a difference.
If not, perform a repair of avast and check again.
If still no difference, perform a clean installation of the latest avast version and check again.

[bob3160]

1 Repair of Avast (try this first) Control Panel > Programs and Features > Select Avast> Select Repair
When the repair finishes, Reboot your system - If this doesn't work then go on to the next step.
2 Clean install of Avast - see my signature for directions How to Successfully Install Avast.