error 577 when i attempt to turn on windows defender win8.1

Anonymous
2013-10-20T17:43:44+00:00
  • very frustrated with my $1,000 new touch screen computer due to windows 8. i download win8.1 from play store looking for a easier os so could enjoy my new computer. but i have a problem windows defender will not turn on!!!!   i tried all community posted things and replies from microsoft. when i press start it gives this error message:[ERROR 577 windows can not digital verify signture for this file ]etc.... come on guys i never had problems win 98xp i loved useing my computer everyday. it was simple to understand and find the fix for the regular guy. now i HATE Using my NEW  COMPUTER DUE TO WIN8 and WINDOWS 8.1 i thought would make things better. i wish i could put win98 or win7 on this computer so i can enjoy my purchase.  anyone know how to get Win8.1 win defender to work??? or want to buy a $1,000 hp i7 with 2 tb 8 gb paper weight?

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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.

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Anonymous
2013-12-16T13:09:01+00:00

http://answers.microsoft.com/en-us/protect/forum/protect_defender-protect_start/windows-defender-not-working-after-upgrade-to/51ff2e69-b7e7-46da-84c9-392bf040ef1e

In the above thread we have seen that OP had same problem as yours and he tried some editing of registry that we normally do not recommend but it worked for him. You may want to give it a try. All you have to do is to:

  1. Press Win key + R. This will open Run.
  2. Type "regedit" and hit enter.
  3. Navigate to these keys:

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows Defender 4. Change value of 'DisableAntiSpyware' and 'DisableAntiVirus' from '0' to '1'. 5. After changing the values go to 'C:\Program Files\Windows Defender' and open 'MSASCui.exe' file.

Hope this will fix the problem.

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Anonymous
2013-10-20T18:55:38+00:00

This error seems to be of Windows rather than of Windows Defender. Please post a question in Windows 8.1 forum, they can help better.

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Anonymous
2013-12-30T14:44:15+00:00

I have seen some more cases like this and I think the problem is specific with Windows Defender only. I want you to try this:

Turn off Windows Defender by going to Settings --> Administrator and unchecking "Turn on this app" and clicking "Save Changes". After turning off Windows Defender, open Registry Editor (in Start menu search for regedit.exe and open it). After opening Registry Editor, navigate to this registry key:

KEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services and change values of 'Start' and 'Type' entries according to the following:

WdBoot -->

Start: 0

Type: 1

WdFilter -->

Start: 0

Type: 2

WdNisDrv -->

Start: 2

Type: 1

WdNisSvc -->

Start: 2

Type: 16

WinDefend -->

Start: 2

Type: 16

Example:

Note: Incorrect editing of registry can cause serious damage to system. And you are doing edits in very sensitive area of registry. So be very careful. If you didn't understand anything then stop and ask it. I will explain in simpler words.

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  1. Anonymous
    2014-11-10T09:23:03+00:00

    How to turn on the Windows Defender in Windows 8.1 (after uninstalling antivirus software).

    1. Press "Window + R" => Type "msconfig" => "Enter"
    2. Go to "Tools" => Choose "Action Center" => Click "Launch" (bottom right button).
    3. Click on the "arrow" next to "Security" (to expand it)
    4. Make changes for the following items:

    a) Virus Protection = ON

    b) Spyware and unwanted software protection = ON

    Hope that helps!

    In reply to all:

    I read elsewhere that uninstalling Spybot Search and destroy would do the trick. And it did!

    So look for any other antivirus / spyware running on your computer. Uninstall it and the turn on windows defender in the action center.

    Hope this helps with this very annoying problem that MS refuses to address!

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  2. Anonymous
    2014-09-26T20:54:13+00:00

    Hi guys,

    I read through all the replies in this thread because I was in exactly the same pain like everyone (error 577 and cannot turn on Windows Defender).

    Luckily I didn't try to do anything with "regedit" thing. I simply removed the anti-virus program which already expired and then voila, Windows Defender appeared by itself after rebooting.

    So guys you can try to make it simple: just clear up whatever antivirus software in your computer and the hidden Win Defender will pop up!

    Hope it helps!

    Good luck!

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