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.

CLEAN your registry of old, obsolete keys using CCleaner, RESTART, clean again!, RESTART. (Windows loves lots of re-starts) "Cleaning" of the registry is very risky and often results in an unbootable computer. If you know that a problem is related to a registry key, it's best to use regedit to clean it up. Just telling CCleaner (or any other registry cleaner) to clean out anything it thinks might be wrong probably won't help. Anyone who isn't comfortable editing the registry should NEVER use a registry cleaner. Jim, that is exactly the reason why I recommended the keys were not added manually. Doing so (incorrectly) could very well result in a Windows machine with an un-bootable Registry. Are you even familiar with CCleaner?? In the 6 years I've been using it, it has not even once resulted in an un-bootable machine! It is a proven problem solution. I strongly recommend it for ALL my clients. Granted, it may clean up some things you don't want cleaned but, there's a mechanism built-in to selectively reverse those changes. No such feature in MS's RegEdit. RegEdit should ONLY be used by very experienced people!!! (I've seen a lot more problems caused by people who thought they knew what they were doing using RegEdit...) By the way, the reason CCleaner was developed in the 1st place was for people who were not comfortable editing their Windows Registry.

CLEAN your registry of old, obsolete keys using CCleaner, RESTART, clean again!, RESTART. (Windows loves lots of re-starts) "Cleaning" of the registry is very risky and often results in an unbootable computer. If you know that a problem is related to a registry key, it's best to use regedit to clean it up. Just telling CCleaner (or any other registry cleaner) to clean out anything it thinks might be wrong probably won't help. Anyone who isn't comfortable editing the registry should NEVER use a registry cleaner.

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.

0 comments

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

2015-03-26T18:12:36+00:00

CLEAN your registry of old, obsolete keys using CCleaner, RESTART, clean again!, RESTART. (Windows loves lots of re-starts)

"Cleaning" of the registry is very risky and often results in an unbootable computer. If you know that a problem is related to a registry key, it's best to use regedit to clean it up. Just telling CCleaner (or any other registry cleaner) to clean out anything it thinks might be wrong probably won't help. Anyone who isn't comfortable editing the registry should NEVER use a registry cleaner.

Jim, that is exactly the reason why I recommended the keys were not added manually. Doing so (incorrectly) could very well result in a Windows machine with an un-bootable Registry. Are you even familiar with CCleaner??

In the 6 years I've been using it, it has not even once resulted in an un-bootable machine! It is a proven problem solution. I strongly recommend it for ALL my clients. Granted, it may clean up some things you don't want cleaned but, there's a mechanism built-in to selectively reverse those changes. No such feature in MS's RegEdit.

RegEdit should ONLY be used by very experienced people!!! (I've seen a lot more problems caused by people who thought they knew what they were doing using RegEdit...)

By the way, the reason CCleaner was developed in the 1st place was for people who were not comfortable editing their Windows Registry.
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Anonymous

2015-03-26T17:31:24+00:00

CLEAN your registry of old, obsolete keys using CCleaner, RESTART, clean again!, RESTART. (Windows loves lots of re-starts)

"Cleaning" of the registry is very risky and often results in an unbootable computer. If you know that a problem is related to a registry key, it's best to use regedit to clean it up. Just telling CCleaner (or any other registry cleaner) to clean out anything it thinks might be wrong probably won't help. Anyone who isn't comfortable editing the registry should NEVER use a registry cleaner.
Was this answer helpful?

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