Just wanted to let you know that the latest update of avast! 4.5.549 has solved my downloads/streaming/email and BSOD issues.
see:
http://forum.avast.com/index.php?board=2;action=display;threadid=8952&start=0
http://forum.avast.com/index.php?board=2;action=display;threadid=9022;start=0
I’m happy to be using avast! again and appreciate everyone’s effort. Thank-you!