Well neither of those have the AIS Firewall in the current version as it isn't AIS, so I don't believe that avast 6 for free/pro will do anything for non-AIS related firewall issues. As you can see my win7 netbook has some latency but not as bad as yours.
So I would suggest following the notes in the bottom window of your image. Use Device Manager and check W-LAN adapters, modems, internal sound devices, USB Host controllers, etc.
There are tools to check your drivers and see if there are any updates available.