After installing avast 4 professional edition My computer would not connect to the internet. I think it had something to do with a conflicting firewall??? With the help of my local cable internet provider (I could not correspond with avast via internet at that time and / or by phone because they do not provide their phone number on the printout ‘receipt’ when I purchased by order!!!) he suggested I uninstall the avast program. I then did that and restarted my computer. Still no connection! Still thinking it might be a firewall problem I uninstalled my McAfee firewall. After I restarted my computer it then connected to the internet once again. My computer is up and running again but I have no antivirus program which I paid for just last week! What can I do? HELP!
I would presume you will have to download avast again and insert your paid for license key to get your pro version back. ;).
Once you’ve re-installed avast, make sure avast is allowed access through your firewall.
Take a look at the following post for more details:
http://forum.avast.com/index.php?topic=40897.msg342997#msg342997
Welcome to the forum. 