Windows Defender is automatically turned off during installation

FAQ » Technical FAQ » AVG 9.0 » Computer Protection » Installation and Uninstallation » Installation » Windows Defender is automatically turned off during installation

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Please note that Windows Defender is only disabled and not removed from the computer.
This is important to prevent conflicts between AVG and Windows Defender. As they are both security applications, they will try to check files you are working with. Since they will do that at the same time, conflicts may arise. These can cause freezing, crashes or slowdown of computer. It is generally not recommend to use more than one security product on one computer.

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