I uninstalled the previous version of Avast 2014 Free Edition from Add/remove, used the avast uninstall utility in safe mode, and used the Avast Cleanup tool in normal mode and did a manual restart. When you go to Avast GUI>Settings>Appearance>Scroll down and put a check mark on Show welcome message on Windows boot screen (Windows 7 or higher).
My OS is Windows 7. When turn on my laptop it shows the windows logo and below it the message doesn’t change to “Protected my Avast! Antivirus”.