If you still know any AVG users who may have this problem I found this at Spywarewarrior
http://www.spywarewarrior.com/viewtopic.php?t=28589
"Claus Valca over at Grand stream Dreams has gotten a tip from one of his readers that with the latest update to AVG the Linkscanner option is now much easier to remove from previous versions. Even thos they still say they won’t be changing default install. "
see link for details
http://grandstreamdreams.blogspot.com/2008/06/avg-free-v-8-sp1-and-more-linkscanner.html
http://grandstreamdreams.blogspot.com/2008/06/remove-linkscanner-from-avg-simply.html
update here
http://grandstreamdreams.blogspot.com/2008/06/playing-in-avg-free-traffic.html
also TeMerc’s website is worth a browse for security fanatics
not exactly something I’d want on my pc