1.Open the AVG Program.
2.On the Tools menu, click Advanced settings.
3.Click Temporarily disable AVG protection in the menu on the left side.
4.Select the Temporarily disable AVG protection check box, and then click OK.
5.Choose how long you want the protection to be disabled and whether to disable the Firewall as well, and then click Disable real-time protection.
http://www.avg.com/ww-en/faq.num-3857