Please, folks, when posible try not to open new topics for the same subject (or related ones). About updating from 4.1.268 to 4.1.278 are the following foruns just today!
http://www.avast.com/forum/index.php?board=2;action=display;threadid=1244 http://www.avast.com/forum/index.php?board=2;action=display;threadid=1395 http://www.avast.com/forum/index.php?board=2;action=display;threadid=1399 http://www.avast.com/forum/index.php?board=2;action=display;threadid=1401
Maybe cross questions & answers could be found. This is just a suggestion