P2P Shield protection

After suffering a virus or Trojan attack during my P2P activities and reading a P2P related post on this forum I decided to check my P2P Shield.

I had it set on “Customize” with ALL boxes ticked, but while downloading the Scanned count remained on zero.
I then selected “High” and once again while downloading the Scanned count remained on zero.
I then selected “Normal” and again while downloading the Scanned count remained on zero.

I am using “Azureus” for my P2P activities.
I notice “Azureus” is not on the customize list. (Are there any plans to include Azureus on this list or do I have to change my P2P program to get P2P Shield protection ?)
I originally used “Limewire” and never had any problems - I was always alerted to any problems.

Something is strange on P2P scanning…
I’ve downloaded a file with emule (.zip).
Only when I’ve unpacked it avast bring up the virus alert.
Shouldn’t it being detected while downloading?