Alright it looks like it’s completely corrupted, Download and save a fresh copy of the avast version you need http://files.avast.com/iavs5x/avast_internet_security_setup.exe and the avast removal tool http://www.avast.com/uninstall-utility click to run the removal tool and accept the action to reboot to safemode where the tool will remove avast for you, when completed reboot again and re-install the newly saved avast version from before and add your license from the email as you did when first licensing the product.

Note that you could first try installing the new avast over the top of your current and see if that works first.