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while it's true, AVG -free has become a turd since at least V.8.x when they removed rootkit detection from the free product
other AVs will always conflict when multiple AV products are installed
however, you can have multiple various anti-whatever products
eg.
install MSE and MBAM, and SpyBot S&D and no conflicts will occur
but
install more than one of the following on the same system AVG, Avira, McAfee, NAV, ect.
and you will certainly have conflicts