how do I reinstall windows defender for windows 10

Anonymous
2016-03-28T04:18:19+00:00

I accidently uninstalled Windows Defender for Windows 10. How do I reinstall it?

[Moved from Windows]

Windows for home | Windows 10 | 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.

0 comments

71 answers

Sort by: Newest
Most helpful Newest Oldest
  1. Anonymous
    2016-05-06T00:46:46+00:00

    I came across a note (sorry...can't recall where) that said Defender would turn itself off if it encountered another anti-virus program (or maybe remnants of one?). It didn't say anything about turning it back on. That might be a clue. I still have no idea how to "reinstall" Defender.

    Was this answer helpful?

    4 people found this answer helpful.
    0 comments
  2. Anonymous
    2016-05-05T23:02:56+00:00

    No I don't get any other messages - defender just keeps turning itself off after I turn it on. In services.msc it status is manual. There was also a "defender network" app which had a status of manual - no idea what this is but that one I could at least turn on. I only just upgraded to Windows 10. Prior to the upgrade I wasn't using defender I was using micro titanium but that seems to have disappeared as well

    Was this answer helpful?

    3 people found this answer helpful.
    0 comments
  3. Anonymous
    2016-05-05T18:06:00+00:00

    it seems like there is some new malware that turns windows defender off.  even when everything else is cleaned out it won't turn back on.

    says the app is turned off by group policy

    Do you have any online reference to this malware or its source? I get the message "not a valid Win32 application".  Also, I could not start the Windows Defender service (Error: 193: 0xc1)

    This occurred after my last comprehensive update of Windows 10 was installed.

    Was this answer helpful?

    8 people found this answer helpful.
    0 comments
  4. Anonymous
    2016-05-05T16:30:55+00:00

    it seems like there is some new malware that turns windows defender off.  even when everything else is cleaned out it won't turn back on.

    says the app is turned off by group policy

    Was this answer helpful?

    20+ people found this answer helpful.
    0 comments
  5. Anonymous
    2016-05-05T13:17:53+00:00

    I have exactly the same problem - but I haven't found any answer posted. How do I get windows defender turned back on?

    Was this answer helpful?

    20+ people found this answer helpful.
    0 comments