This bit of info is for anyone that is using Thunderbird to download their Hotmail email and using AVG to scan it.
Apparently there is a problem, and they are working on it.
...AVG Free program update 7.5.518 has been temporarily withdrawn & replaced by 7.5.516. This situation will be corrected shortly.
http://forum.grisoft.cz/freeforum/read.php?3,118158,118158#msg-118158