Fix Error Code 0x800704ec Windows Defender Won’t Turn On

Policy settings for Windows Defender:

Policy setting: Turn off Windows Defender
Registry key name:
HKEY_LOCAL_MACHINESOFTWAREPoliciesMicrosoftWindows DefenderDisableAntiSpyware
Policy description: Turns off Windows Defender Real-Time Protection. No more scans are scheduled.

If you enable this policy setting, Windows Defender does not run. Computers are not scanned for spyware or other potentially unwanted software. If you disable or do not configure this policy setting, Windows Defender runs, and computers are scanned for spyware and other potentially unwanted software.
Policy setting: Turn off Real-Time Protection Prompts for Unknown Detection
Registry key name:
HKEY_LOCAL_MACHINESOFTWAREPoliciesMicrosoftWindows DefenderReal-Time ProtectionEnableUnknownPrompts
Policy description: Turns off Real-Time Protection prompts for unknown detection.

If you enable this setting, Windows Defender prompts users to allow or block unknown activity on the pc. If you disable or do not configure this policy setting, Windows Defender does not prompt users to allow or block unknown activity.
Policy setting: Check for New Signatures Before Scheduled Scans
Registry key name:
HKEY_LOCAL_MACHINESOFTWAREPoliciesMicrosoftWindows DefenderScanCheckForSignaturesBeforeRunningScan
Policy description: Checks for new signatures before scheduled scans run.

If you enable this policy setting, Windows Defender checks for new signatures before a scheduled scan runs. If you disable or do not configure this policy setting, Windows Defender does not check for new signatures before a scheduled scan runs.
Policy setting: Download Entire Signature Set
Registry key name:
HKEY_LOCAL_MACHINESOFTWAREPoliciesMicrosoftWindows DefenderSignature UpdatesForceFullUpdate
Policy description: Downloads the full signature set instead of only the signatures that have been updated since the last signature download. Downloading the full signature set may help troubleshoot problems with signature installations. However, the download may take longer to finish because the full signature set is larger than the new signature set.

If you enable this policy setting, the full signatures set is downloaded. If you disable or do not configure this policy setting, only updated signatures are downloaded.
Policy setting: Enable Logging Known Good Detections
Registry key name:
HKEY_LOCAL_MACHINESOFTWAREPoliciesMicrosoftWindows DefenderReportingDisableLoggingForKnownGood
Policy description: Enables logging detection data during Real-time Protection when Windows Defender detects known good files. Logging detection data gives you detailed information about the programs that run on the computers that you monitor.

If you enable this policy setting, known good files are logged. If you disable or do not configure this policy setting, known good files are not logged.

Note Enabling this policy setting may result in more events in the log.
Policy setting: Enable Logging Unknown Detections
Registry key name:
HKEY_LOCAL_MACHINESOFTWAREPoliciesMicrosoftWindows DefenderReportingDisableLoggingForUnknown
Policy description: Enables logging detections during Real-time Protection when Windows Defender detects unknown files. Logging detections gives you detailed information about the programs that run on the computers that you monitor.

If you enable or do not configure this policy setting, unknown files are logged. If you disable this policy setting, unknown files are not logged.

Note Enabling this policy setting may result in more events in the log.
Policy setting: Configure Microsoft SpyNet Reporting
Registry key name:
HKEY_LOCAL_MACHINESOFTWAREPoliciesMicrosoftWindows DefenderSpyNetSpyNetReporting
Policy description: Adjusts membership in Microsoft SpyNet.

Microsoft SpyNet is the online community that helps you decide how to respond to potential spyware threats. The community also helps stop the spread of new spyware infections.

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