Cannot activate Windows Defender - 0x800705b4 appears instead.

No matter how I approach Windows Defender (Control Panel, security, etc.), I can't activate it.  I always get the code 0x800705b4, which says 'timeout expired '.  I followed all the instructions to the letter and have tried to solve this problem for about six hours each day for four days.  Help!

using microsoft security essentials

Tags: Windows

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