Have you done a Reset yet? http://answers.microsoft.com/en-us/windows/forum/windows8_1-performance/windows-defender-81-was-somehow-uninstalled/55ed8483-833d-4d3b-88ed-0e02b0ac6537?page=4#LastReply
Windows Defender in Windows 8.1 Will Not Turn On
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Anonymous
I recently updated Windows 8 to Windows 8.1. Windows Defender had been on in Windows 8 and even after the update to 8.1. I turned it off momentarily but have been unable to turn it back on. To my knowledge, I have no other anti-virus programs running. How can I turn it back on?
Windows for home | Previous Windows versions | Security and privacy
Locked Question. This question was migrated from the Microsoft Support Community. You can vote on whether it's helpful, but you can't add comments or replies or follow the question.
165 answers
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Anonymous
2015-06-04T05:55:41+00:00 -
Anonymous
2015-06-03T08:57:10+00:00 May I point out to you that this is a fórum where people strive to help one another so I have every right to pass my information on to other members just as you have! Ok, what I have to say is not that positive but neither are the questions as they shame Microsoft for putting out software that doesn't work for so many people!
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Anonymous
2015-06-02T23:28:58+00:00 For me neither but if I comment here I immediately get a guy telling me not to do so...
No, I politely asked you to post any/all further follow-up in replies to your own, new thread => http://answers.microsoft.com/thread/55ed8483-833d-4d3b-88ed-0e02b0ac6537
You may obtain Microsoft-sponsored Premium Support via the Answer Desk => http://answerdesk.microsoftstore.com
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Anonymous
2015-06-02T23:27:13+00:00 So do you have a way of getting Windows Defender back up & running? I tried everything nothing works for me.. Hope uno more than me. Doggess!
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Anonymous
2015-06-02T22:52:20+00:00 For me neither but if I comment here I immediately get a guy telling me not to do so, that I am only allowed to comment on my question which is stupid because otherwise why would these other questions be sent to me? I don't think Microsoft wants people to know that so many people have either lost the Defender, which is my case or can't get it to work. This is ridiculous!