Download again to your hard disk. Then run from that folder. Don't run online.
Download from http://free.avg.com/download-avg-anti-virus-free-edition
Installer initialization failed due to the following error:
Warning: Internal error. Dialog with id "AvgDetectedDlg" was not found in the setup.
I jsut wanted to download the avg free edition. Any suggestions on how to overcome this internal error?