I managed to sort AVG 2011 settings work around recently to enable my (external device) Treo phone to sync to PC (Vista) but have since updated the AVG settings, inadvertantly.  This means the Treo no longer shows up on my computer as 'connected' but Windows Mobile Device Center settings all seem fine.  I know that I disabled 'resident shield' and one other thing to get the sync to work last time round. 
The Treo shows as 'connected' both via bluetooth (what I usually use to sync) and with direct connection, but PC does not.

I did find the following info on AVG site but none the wiser as cannot find the 'Firewall' - no longer a term on 2011 version? http://www.avg.com/id-en/faq.num-812#num-812

Has anyone worked this through before and can help me please?