Hi everyone! I updated today to Avast Home 4.6.603 but in Windows XP SP2 Security Center the program version appears as 4.5.603. I guess it must be a very small bug/incompatibility.
Yes. Please see e.g. http://forum.avast.com/index.php?topic=11300.0 or http://forum.avast.com/index.php?topic=11420.0