This is a weird problem. Avast will hang my system whenever I do a update attempt. The hang manifests itself usually within a few seconds I can move my mouse, I can click on interface components I just can't open new programs, or anything that requires significant action on Window's part. If I attempt to navigate from a webpage say IE is already open it will hang but I can switch focus between already opened tabs till my heart is content.
This problem started about a month ago. The last time I did a full system scan which was a few days ago it was clean, so I did a scan with Spyware Terminator 2012 it was clean to, I did a scan with Outpost Security Suite 7.1 it was clean to. I have Windows 7 Ultimate 64 bit Service Pack 1 the other programs I use is Outpost Security Suite 7.1.1 (3431.520.1248), Spyware Terminator 2012 3.0.0.50, And Avast Antivirus 6.0.1367.