How to Fix Windows Defender Authentication Failed Error
If you see "Authentication failed" when opening Windows Defender or trying to run a scan, it usua...
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You try to install or update a Microsoft Teams app or custom bot, and get an error like 'dependen...
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How to Fix Windows Security Service Unavailable
When Windows Security shows "Service unavailable" or a red banner, your antivirus and firewall pr...
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After a Windows update, you might see "Access Denied" errors when trying to open Windows Security...