The computer in question is running win 7 x64.
After you have logged into the computer the network driver can take up to two minutes to initialize and only after that time does the computer have a working network connection. I know this is due to the avast firewall driver delaying the initialization. I see these entries in the firewall log file.
5/21/2012 7:48:04 PM GetBestInterface error 1231
5/21/2012 7:48:04 PM SendARP error 87
5/21/2012 7:48:06 PM GetBestInterface error 1231
5/21/2012 7:48:06 PM SendARP error 87
When is the next release of avast coming out? 1426 has been out for a while and in my opinion has issues that need fixing.