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? <Moved from Windows>

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: Press Win key + R. This will open Run. Type "regedit" and hit enter. 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.

Finally got the solution for error 577 after a long tiring day.....looked every forums and site to get the solution...but just have to look some settings first... first enable the security center settings as explained in this link : https://support.microsoft.com/en-in/kb/2519899 then open action center and turn on the windows security... after that try this step : a) Press “Windows Logo” + “R” keys on the keyboard to open the “ Run ” command box. b) Type “ Services.msc ” in the “ Run ” command box and press “ Enter ”. c) In the “ Services ” window, search for the “ Windows Defender ” service from that list. d) Double-click on it to open its “ Properties ” window. e) From its “ Properties ” window, click on “ Start ” when the service is stopped and also change its “ Startup Type ” to “ Automatic ”. f) Click on “ Apply ” and “ Ok ”. g) Restart the computer and check if that resolves the issue. a) From the Windows 8 Start Screen , type “ Defender ”. Windows Defender should appear in the list. b) Right click on the “ Windows Defender ” icon and select “ Run as Administrator ” from that menu. c) Check if that launches Windows Defender on the computer and check if you are able to turn it ON . Tell me if it also helps you out...

Instead of setting DisableAntiSpyware to 1, simply delete this key.

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

Anonymous

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?

<Moved from Windows>

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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Answer accepted by question author

Anonymous

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:

Press Win key + R. This will open Run.
Type "regedit" and hit enter.
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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Answer accepted by question author

Anonymous

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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Answer accepted by question author

Anonymous

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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159 additional answers

Anonymous

2016-08-22T11:47:47+00:00

Finally got the solution for error 577 after a long tiring day.....looked every forums and site to get the solution...but just have to look some settings first...

first enable the security center settings as explained in this link :

https://support.microsoft.com/en-in/kb/2519899

then open action center and turn on the windows security...

after that try this step :

a)       Press “Windows Logo” + “R” keys on the keyboard to open the “Run” command box.

b)       Type “Services.msc” in the “Run” command box and press “Enter”.

c)       In the “Services” window, search for the “Windows Defender” service from that list.

d)       Double-click on it to open its “Properties” window.

e)       From its “Properties” window, click on “Start” when the service is stopped and also change its “Startup Type” to “Automatic”.

f)        Click on “Apply” and “Ok”.

g)       Restart the computer and check if that resolves the issue.

a)       From the Windows 8 Start Screen, type “Defender”. Windows Defender should appear in the list.

b)       Right click on the “Windows Defender” icon and select “Run as Administrator” from that menu.

c)       Check if that launches Windows Defender on the computer and check if you are able to turn it ON.

Tell me if it also helps you out...
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Anonymous

2016-06-14T16:36:33+00:00

Instead of setting DisableAntiSpyware to 1, simply delete this key.
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