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According to the Avast manual you can disable the program as follows:

Avast “System Tray” Icon
The orange avast! icon located in your computer’s system tray can be used to access various features without opening the main user interface. If you right-click on the avast! icon, a short menu will appear.
You can choose to open the main interface and use the program as normal, or select any of the other options directly from the menu.
• By selecting “avast! shields control”, you can turn off all of the shields permanently, or for just the selected period of time.

In most cases the 10 minute disable should work.