We originally had problems with avast and avg when I first created the installers, it was solved by me sending the packed and unpacked containing contents to both companies with our activation date, fortunately both compainies fixed before we shipped, very kind of them
I advise if you are concerned you email them the file and tell them the problems you are having. They usually respond very fast and fix problems.
The reason why the installer and uninstaller in this case gets flagged is I used a autoit script to delete any previous versions of old installers including our older versions and because autoit tends to be used by people with less than good coding skills, but can quite quickly create backdoor servers or trogens as you will all know them that sometimes AntiVirus companies just flag autoit scripts just because they detected autoit scripts....... Not useful.
So yeah, they should be perfectly clean, ill check md5's just incase but I suspect its just a false positive. Please let me know if you hear anything back from AVG.