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Susan Bradley's first reply on the thread you provided link to: Further, Windows Defender is the only trouble now. I am afraid of bigger trouble during refresh. Since the instruction asks for CD, my computer didn't come with a CD. The only method I haven't tried yet is to refresh. (3) Tried every step in "Problems starting Windows Defender in Windows 8/8.1", such as sfc, clean boot, registry clean, etc. (2) Tried manually install the definition. (1) Tried every tool of the anti-virus software removal list, plus some tools in other articles of community forum. I spent two full days and tried all the methods listed in misc articles. The Windows Update seems still working automatically, and Windows Defender can be automatically started. The Action Center also shows two red area and says "Windows Defender is turned off". But in fact, I have good internet connection. It says "check your internet or network connection and try again".

Recently I found whenever I click the update button, the update for virus and spyware definition failed. In 2014, the original windows 8 was upgraded into windows 8.1. It was shipped with Mcafee, which was removed later on.