プログラム＆セットアップ更新されました。 

Menu→更新(U)→プログラムの更新（P)で確認して下さい。

Version 4.7.1001
April 30, 2007
・Professional Edition: fixed installation of the ScriptBlocker module which could have previously
 caused various problems (e.g. in Internet Explorer)
・program installation now completes successfully even if Spyware Doctor is installed
 (the "OnGuard" module of Spyware Doctor contains a bug that was previously preventing the
 avast installation from working correctly)
・program installation now better handles the situation when repairing previous (corrupted)
 installs
・mail scanner: fix for marking of new emails as "read" (the problem was taking place in
 Thunderbird 2.0 in conjunction with some IMAP servers)
・fix for scanning of areas with East Asian names (Windows NT/2000/XP/Vista)
・added Armadillo unpacker

尚、プログラム更新後はPCの再起動が必要です。

http://www.avast.com/eng/avast-4-home_pro-revision-history.html