repost your problem at the AVG Forum here at cnet as a AVG Authorised specialist should respond and probably has seen this recently:
My computer had been away for a few months for repairs and upon getting it back I have tried to update al my software. AVG scan on 3/8/2010 detected: c:\Program Files\edd.exe - Trojan Horse BackDoor.Generic12.CDOT - Not healed or removed.
Since then I have not been able to download any files (except for the AVG Update on 7/8/2010). i get an error box after a minute of trying to download stating:
Internet explorer is unable to download <file.exe> from <website.com>
Internet explorer was unable to open this site. The requested site is either unavailable or cannot be found. Please try again later.
Since the AVG update it has not been detected and I cant find it located at the path specified, however my Online Armor detected a keylogger and screenlogger (which it says is iexplore.exe) at the same time as the trojan was found. If AVG couldn't remove it, where did it go? Why is my Explorer suddenly detected as a key logger and screen logger threat? Is it just a coincidence that they happened at the same time? Why can't I download anymore? How do I fix it????