About aswcmnb.dll, maybe some information here:
http://forum.avast.com/index.php?board=2;action=display;threadid=5938;start=30
Comparison between Home and Pro version:
http://www.avast.com/i_idt_1018.html
About avast and Norton, please, search a bit on the board… You will see why we give up from NAV and use avast 8)