I don't use AVG myself, so i'm unable to test, does it employ heuristic scanning? if so, is there, as there is in my AV software a setting for how paranoid that is? & could having that set high be the cause of those few alerts? or does anyone know if it's a version specific thing, perhaps an older/newer version has a less accurate mechanism for determining this? just some thoughts, if someone is checking this out.. if it turns out to be an old version thing, the answer would be obvious... update to the latest..
I'd advise Flush to do a quick check at AVG's site that they has the latest available version at least if it's the free one in use.