After the last major update, my computer became inoperable. I tried everything, but it would only get to the blue splash screen. I tried all the advise others gave me (thank you for it), but it did nothing. I even heard back from the Avast team, but they too couldn't help. I had to take my computer in for servicing. They basically saved my data files, etc. and I had to completely re-install Windows.
To say the least I am not impressed with Avast. I realize the program was free, but not when it completely ruins your system. It cost me to get my system fixed. I came to the website today just to let others know that they should be very leery.
I won't use it again.