the LinkScanner process is not scanned by the web shield. What is scanned by the web shield is the traffic between LinkScanner and AVG online database I suppose, so it's that that you need to exclude if possible. Go to AVG forums and ask for servers addresses..otherwise, OK, deactivate your web shield first, launch your browser, and after a search look in your firewall activity what connections are made by the LinkScanner. Then go to DNSstuff (
http://www.dnsstuff.com/ ) to find out the corresponding URLS. Add these URLS to the webshield exclusion list, this could work...
edit: yeah, I don't think you can add an IP or an IP range to the webshield exclusion list, you need the exact URL...