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I recently was forced to install the 1709 Windows 10 Fall Creator's Edition, and ever since then Windows Defender is my main AV. I already paid for PCMatic to be my AV, but I can't somehow make it my default. I cannot deactivate Windows Defender or turn on PCMatic via the conventional method of going in the Control Panel. I see Windows Defender and PCMatic Super shield in the 'Secutiry Maintenance' box but the button to turn on PCMatic is greyed out. I thought WD deactivated itself when there was another 3rd party AV installed. It has worked before and WD was deactivated, but ever since the update, it will not turn off and I think it is slowing my computer down. Thanks