It seems that you’ve changed the avast settings without knowing what you were doing…
This is an option disabled by default. You can turn it off going to the Standard Shield provider settings, Advanced tab an unchecking ‘Show detailed information on action performed’. You can do this for the other providers too.
See http://forum.avast.com/index.php?topic=26104.msg213436#msg213436

Welcome to avast. The most configurable antivirus around 8)

But I can’t understand why aren’t you worried to get rid of the cause of the problem and be clean ???