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Knuckles McGinty - the one time you definitely don't want to turn off your AV is when you're installing software
I have Mathematica for econometric modelling - never had to turn off my AV to install or run. Nor I imagine have Yelland's Bank or Gold in Sacks
Where on the Wolfram website does it advise to turn off one's AV before installing the CDF player, I couldn't see anything.
I wonder if you have somethng awry with your computer system
BR