Just reading my copy of computeractive today and noticed a answer to AVG update problems i have noticed a lot of you have been having. The story was saying that as it is free they dont have the resources to support the site and that due to it being american you should update early in the morning but they provided a link for people still unable to download the latest patch here it is............ click here. this page holds the different updates i hope this helps a bit.
try this right click on AVG Control center click on info tab and look at version number each update has details on what version it will upgrade, look for the update number that has a minimum required version that matches yours and click on it to download. when asked to save select the AVG update folder which should be C:\PROGRAMFILES\GIRSOFT\AVG\UPDATE when file has finished download right click on the AVG icon in system tray and click on run AVG ANTI-VIRUS THE UPDATE SHOULD BE INSTALLED