How to Fix 'Port Already Allocated' for Windows Update Service
You might see a 'port already allocated' error when Windows Update tries to use a specific port t...
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Browse manualsFix Windows Security Center Version Mismatch Errors
You open Windows Security and see a message about a version mismatch, or the Security Center serv...
How to Fix Windows Defender Setup When Version Mismatch Occurs
You try to enable or update Windows Defender, but get an error about a version mismatch. This typ...
How to Fix Windows Security Not Opening
You click the Windows Security icon in the taskbar or open it from Settings, but nothing happens—...
Fix Windows Store Error 0x80073cf9: Configuration Issue
When you see error code 0x80073cf9 while trying to install or update an app from the Windows Stor...
How to Fix 'Microsoft Store Not Opening' Permission Denied Error
You click the Microsoft Store icon, but nothing happens—or you see a "permission denied" message....
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SitemapWindows Defender Proxy Error Fix Windows 10
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