Hello Vaibhav. If you are using a proxy server for the Internet, you will have to specify the name of the proxy server and its port for the AVG update settings. For this, double click on the AVG icon in the system tray, click on the Update Manager link and click Settings.

choose Use proxy server. Fill in the fields for the proxy server IP address and port number. If your proxy needs authentication, then fill in the username and password too. Save and update. Updates for AVG version 7.0 might not be available anymore, since version 7.5 is currently being phased out and 8.0 has been launched. It will not recognize the update files if they are for a newer version than you are using. You can upgrade to AVG 8.0, and then enter the proxy settings under 'Tools I Advanced Settings ... I Proxy'.