"C:\Program Files\AVG\AVG10\avgmfapx.exe" /AppMode=SETUP /Uninstall
What I've found odd about the AVG 11 uninstaller (and installer) is that it goes off the assumption that there is an AVG10, as AVG 11 uses AVG10 system files.
Be sure to google your .exe parameters to run both the install or uninstall silently or with whatever else you like, as .exe parameters can differ from MSI parameters.
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